Add commits dropdown in PR files view and allow commit by commit review (#25528)

This PR adds a new dropdown to select a commit or a commit range
(shift-click like github) of a Pull Request.
After selection of a commit only the changes of this commit will be shown.
When selecting a range of commits the diff of this range is shown.

This allows to review a PR commit by commit or by viewing only commit ranges.
The "Show changes since your last review" mechanism github uses is implemented, too.
When reviewing a single commit or a commit range the "Viewed" functionality is disabled.

## Screenshots

### The commit dropdown

![image](https://github.com/go-gitea/gitea/assets/51889757/0db3ae62-1272-436c-be64-4730c5d611e3)

### Selecting a commit range

![image](https://github.com/go-gitea/gitea/assets/51889757/ad81eedb-8437-42b0-8073-2d940c25fe8f)

### Show changes of a single commit only

![image](https://github.com/go-gitea/gitea/assets/51889757/6b1a113b-73ef-4ecc-adf6-bc2340bb8f97)

### Show changes of a commit range

![image](https://github.com/go-gitea/gitea/assets/51889757/6401b358-cd66-4c09-8baa-6cf6177f23a7)


Fixes https://github.com/go-gitea/gitea/issues/20989
Fixes https://github.com/go-gitea/gitea/issues/19263

---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>

models/fixtures/issue.yml

@@ -304,3 +304,20 @@
   created_unix: 946684830
   updated_unix: 978307200
   is_locked: false
+
+-
+  id: 19
+  repo_id: 58
+  index: 1
+  poster_id: 2
+  original_author_id: 0
+  name: issue for pr
+  content: content
+  milestone_id: 0
+  priority: 0
+  is_closed: false
+  is_pull: true
+  num_comments: 0
+  created_unix: 946684830
+  updated_unix: 978307200
+  is_locked: false

models/fixtures/pull_request.yml

@@ -76,3 +76,16 @@
   base_branch: master
   merge_base: 2a47ca4b614a9f5a
   has_merged: false
+
+-
+  id: 7
+  type: 0 # gitea pull request
+  status: 2 # mergable
+  issue_id: 19
+  index: 1
+  head_repo_id: 58
+  base_repo_id: 58
+  head_branch: branch1
+  base_branch: main
+  merge_base: cbff181af4c9c7fee3cf6c106699e07d9a3f54e6
+  has_merged: false

models/fixtures/repo_unit.yml

@@ -607,3 +607,33 @@
   repo_id: 52
   type: 1
   created_unix: 946684810
+
+-
+  id: 91
+  repo_id: 58
+  type: 1
+  created_unix: 946684810
+
+-
+  id: 92
+  repo_id: 58
+  type: 2
+  created_unix: 946684810
+
+-
+  id: 93
+  repo_id: 58
+  type: 3
+  created_unix: 946684810
+
+-
+  id: 94
+  repo_id: 58
+  type: 4
+  created_unix: 946684810
+
+-
+  id: 95
+  repo_id: 58
+  type: 5
+  created_unix: 946684810

models/fixtures/repository.yml

@@ -1662,3 +1662,34 @@
   is_private: false
   status: 0
   num_issues: 0
+
+-
+  id: 58 # org public repo
+  owner_id: 2
+  owner_name: user2
+  lower_name: commitsonpr
+  name: commitsonpr
+  default_branch: main
+  num_watches: 0
+  num_stars: 0
+  num_forks: 0
+  num_issues: 0
+  num_closed_issues: 0
+  num_pulls: 1
+  num_closed_pulls: 0
+  num_milestones: 0
+  num_closed_milestones: 0
+  num_projects: 0
+  num_closed_projects: 0
+  is_private: false
+  is_empty: false
+  is_archived: false
+  is_mirror: false
+  status: 0
+  is_fork: false
+  fork_id: 0
+  is_template: false
+  template_id: 0
+  size: 0
+  is_fsck_enabled: true
+  close_issues_via_commit_in_any_branch: false

models/fixtures/user.yml

@@ -66,7 +66,7 @@
   num_followers: 2
   num_following: 1
   num_stars: 2
-  num_repos: 13
+  num_repos: 14
   num_teams: 0
   num_members: 0
   visibility: 0

models/issues/issue_test.go

@@ -538,7 +538,7 @@ func TestCountIssues(t *testing.T) {
 	assert.NoError(t, unittest.PrepareTestDatabase())
 	count, err := issues_model.CountIssues(db.DefaultContext, &issues_model.IssuesOptions{})
 	assert.NoError(t, err)
-	assert.EqualValues(t, 18, count)
+	assert.EqualValues(t, 19, count)
 }
 
 func TestIssueLoadAttributes(t *testing.T) {

models/repo/repo_list_test.go

@@ -235,12 +235,12 @@ func TestSearchRepository(t *testing.T) {
 		{
 			name:  "AllPublic/PublicRepositoriesOfUserIncludingCollaborative",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 15, AllPublic: true, Template: util.OptionalBoolFalse},
-			count: 30,
+			count: 31,
 		},
 		{
 			name:  "AllPublic/PublicAndPrivateRepositoriesOfUserIncludingCollaborative",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 15, Private: true, AllPublic: true, AllLimited: true, Template: util.OptionalBoolFalse},
-			count: 35,
+			count: 36,
 		},
 		{
 			name:  "AllPublic/PublicAndPrivateRepositoriesOfUserIncludingCollaborativeByName",
@@ -255,7 +255,7 @@ func TestSearchRepository(t *testing.T) {
 		{
 			name:  "AllPublic/PublicRepositoriesOfOrganization",
 			opts:  &repo_model.SearchRepoOptions{ListOptions: db.ListOptions{Page: 1, PageSize: 10}, OwnerID: 17, AllPublic: true, Collaborate: util.OptionalBoolFalse, Template: util.OptionalBoolFalse},
-			count: 30,
+			count: 31,
 		},
 		{
 			name:  "AllTemplates",

options/locale/locale_en-US.ini

@@ -1662,6 +1662,13 @@ pulls.switch_comparison_type = Switch comparison type
 pulls.switch_head_and_base = Switch head and base
 pulls.filter_branch = Filter branch
 pulls.no_results = No results found.
+pulls.show_all_commits = Show all commits
+pulls.show_changes_since_your_last_review = Show changes since your last review
+pulls.showing_only_single_commit = Showing only changes of commit %[1]s
+pulls.showing_specified_commit_range = Showing only changes between %[1]s..%[2]s
+pulls.select_commit_hold_shift_for_range = Select commit. Hold shift + click to select a range
+pulls.review_only_possible_for_full_diff = Review is only possible when viewing the full diff
+pulls.filter_changes_by_commit = Filter by commit
 pulls.nothing_to_compare = These branches are equal. There is no need to create a pull request.
 pulls.nothing_to_compare_and_allow_empty_pr = These branches are equal. This PR will be empty.
 pulls.has_pull_request = `A pull request between these branches already exists: <a href="%[1]s">%[2]s#%[3]d</a>`

routers/web/repo/pull.go

@@ -694,6 +694,42 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 	return compareInfo
 }
 
+type pullCommitList struct {
+	Commits             []pull_service.CommitInfo `json:"commits"`
+	LastReviewCommitSha string                    `json:"last_review_commit_sha"`
+	Locale              map[string]string         `json:"locale"`
+}
+
+// GetPullCommits get all commits for given pull request
+func GetPullCommits(ctx *context.Context) {
+	issue := checkPullInfo(ctx)
+	if ctx.Written() {
+		return
+	}
+	resp := &pullCommitList{}
+
+	commits, lastReviewCommitSha, err := pull_service.GetPullCommits(ctx, issue)
+	if err != nil {
+		ctx.JSON(http.StatusInternalServerError, err)
+		return
+	}
+
+	// Get the needed locale
+	resp.Locale = map[string]string{
+		"lang":                                ctx.Locale.Language(),
+		"filter_changes_by_commit":            ctx.Tr("repo.pulls.filter_changes_by_commit"),
+		"show_all_commits":                    ctx.Tr("repo.pulls.show_all_commits"),
+		"stats_num_commits":                   ctx.TrN(len(commits), "repo.activity.git_stats_commit_1", "repo.activity.git_stats_commit_n", len(commits)),
+		"show_changes_since_your_last_review": ctx.Tr("repo.pulls.show_changes_since_your_last_review"),
+		"select_commit_hold_shift_for_range":  ctx.Tr("repo.pulls.select_commit_hold_shift_for_range"),
+	}
+
+	resp.Commits = commits
+	resp.LastReviewCommitSha = lastReviewCommitSha
+
+	ctx.JSON(http.StatusOK, resp)
+}
+
 // ViewPullCommits show commits for a pull request
 func ViewPullCommits(ctx *context.Context) {
 	ctx.Data["PageIsPullList"] = true
@@ -739,7 +775,7 @@ func ViewPullCommits(ctx *context.Context) {
 }
 
 // ViewPullFiles render pull request changed files list page
-func ViewPullFiles(ctx *context.Context) {
+func viewPullFiles(ctx *context.Context, specifiedStartCommit, specifiedEndCommit string, willShowSpecifiedCommitRange, willShowSpecifiedCommit bool) {
 	ctx.Data["PageIsPullList"] = true
 	ctx.Data["PageIsPullFiles"] = true
 
@@ -762,6 +798,33 @@ func ViewPullFiles(ctx *context.Context) {
 		prInfo = PrepareViewPullInfo(ctx, issue)
 	}
 
+	// Validate the given commit sha to show (if any passed)
+	if willShowSpecifiedCommit || willShowSpecifiedCommitRange {
+
+		foundStartCommit := len(specifiedStartCommit) == 0
+		foundEndCommit := len(specifiedEndCommit) == 0
+
+		if !(foundStartCommit && foundEndCommit) {
+			for _, commit := range prInfo.Commits {
+				if commit.ID.String() == specifiedStartCommit {
+					foundStartCommit = true
+				}
+				if commit.ID.String() == specifiedEndCommit {
+					foundEndCommit = true
+				}
+
+				if foundStartCommit && foundEndCommit {
+					break
+				}
+			}
+		}
+
+		if !(foundStartCommit && foundEndCommit) {
+			ctx.NotFound("Given SHA1 not found for this PR", nil)
+			return
+		}
+	}
+
 	if ctx.Written() {
 		return
 	} else if prInfo == nil {
@@ -775,12 +838,30 @@ func ViewPullFiles(ctx *context.Context) {
 		return
 	}
 
-	startCommitID = prInfo.MergeBase
+	ctx.Data["IsShowingOnlySingleCommit"] = willShowSpecifiedCommit
+
+	if willShowSpecifiedCommit || willShowSpecifiedCommitRange {
+		if len(specifiedEndCommit) > 0 {
+			endCommitID = specifiedEndCommit
+		} else {
 			endCommitID = headCommitID
+		}
+		if len(specifiedStartCommit) > 0 {
+			startCommitID = specifiedStartCommit
+		} else {
+			startCommitID = prInfo.MergeBase
+		}
+		ctx.Data["IsShowingAllCommits"] = false
+	} else {
+		endCommitID = headCommitID
+		startCommitID = prInfo.MergeBase
+		ctx.Data["IsShowingAllCommits"] = true
+	}
 
 	ctx.Data["Username"] = ctx.Repo.Owner.Name
 	ctx.Data["Reponame"] = ctx.Repo.Repository.Name
 	ctx.Data["AfterCommitID"] = endCommitID
+	ctx.Data["BeforeCommitID"] = startCommitID
 
 	fileOnly := ctx.FormBool("file-only")
 
@@ -789,8 +870,8 @@ func ViewPullFiles(ctx *context.Context) {
 	if fileOnly && (len(files) == 2 || len(files) == 1) {
 		maxLines, maxFiles = -1, -1
 	}
+
 	diffOptions := &gitdiff.DiffOptions{
-		BeforeCommitID:     startCommitID,
 		AfterCommitID:      endCommitID,
 		SkipTo:             ctx.FormString("skip-to"),
 		MaxLines:           maxLines,
@@ -799,9 +880,18 @@ func ViewPullFiles(ctx *context.Context) {
 		WhitespaceBehavior: gitdiff.GetWhitespaceFlag(ctx.Data["WhitespaceBehavior"].(string)),
 	}
 
+	if !willShowSpecifiedCommit {
+		diffOptions.BeforeCommitID = startCommitID
+	}
+
 	var methodWithError string
 	var diff *gitdiff.Diff
-	if !ctx.IsSigned {
+
+	// if we're not logged in or only a single commit (or commit range) is shown we
+	// have to load only the diff and not get the viewed information
+	// as the viewed information is designed to be loaded only on latest PR
+	// diff and if you're signed in.
+	if !ctx.IsSigned || willShowSpecifiedCommit || willShowSpecifiedCommitRange {
 		diff, err = gitdiff.GetDiff(gitRepo, diffOptions, files...)
 		methodWithError = "GetDiff"
 	} else {
@@ -908,6 +998,22 @@ func ViewPullFiles(ctx *context.Context) {
 	ctx.HTML(http.StatusOK, tplPullFiles)
 }
 
+func ViewPullFilesForSingleCommit(ctx *context.Context) {
+	viewPullFiles(ctx, "", ctx.Params("sha"), true, true)
+}
+
+func ViewPullFilesForRange(ctx *context.Context) {
+	viewPullFiles(ctx, ctx.Params("shaFrom"), ctx.Params("shaTo"), true, false)
+}
+
+func ViewPullFilesStartingFromCommit(ctx *context.Context) {
+	viewPullFiles(ctx, "", ctx.Params("sha"), true, false)
+}
+
+func ViewPullFilesForAllCommitsOfPr(ctx *context.Context) {
+	viewPullFiles(ctx, "", "", false, false)
+}
+
 // UpdatePullRequest merge PR's baseBranch into headBranch
 func UpdatePullRequest(ctx *context.Context) {
 	issue := checkPullInfo(ctx)

routers/web/user/home_test.go

@@ -75,7 +75,7 @@ func TestPulls(t *testing.T) {
 	Pulls(ctx)
 	assert.EqualValues(t, http.StatusOK, ctx.Resp.Status())
 
-	assert.Len(t, ctx.Data["Issues"], 4)
+	assert.Len(t, ctx.Data["Issues"], 5)
 }
 
 func TestMilestones(t *testing.T) {

routers/web/web.go

@@ -1279,14 +1279,20 @@ func registerRoutes(m *web.Route) {
 			m.Get("", repo.SetWhitespaceBehavior, repo.GetPullDiffStats, repo.ViewIssue)
 			m.Get(".diff", repo.DownloadPullDiff)
 			m.Get(".patch", repo.DownloadPullPatch)
-			m.Get("/commits", context.RepoRef(), repo.SetWhitespaceBehavior, repo.GetPullDiffStats, repo.ViewPullCommits)
+			m.Group("/commits", func() {
+				m.Get("", context.RepoRef(), repo.SetWhitespaceBehavior, repo.GetPullDiffStats, repo.ViewPullCommits)
+				m.Get("/list", context.RepoRef(), repo.GetPullCommits)
+				m.Get("/{sha:[a-f0-9]{7,40}}", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFilesForSingleCommit)
+			})
 			m.Post("/merge", context.RepoMustNotBeArchived(), web.Bind(forms.MergePullRequestForm{}), repo.MergePullRequest)
 			m.Post("/cancel_auto_merge", context.RepoMustNotBeArchived(), repo.CancelAutoMergePullRequest)
 			m.Post("/update", repo.UpdatePullRequest)
 			m.Post("/set_allow_maintainer_edit", web.Bind(forms.UpdateAllowEditsForm{}), repo.SetAllowEdits)
 			m.Post("/cleanup", context.RepoMustNotBeArchived(), context.RepoRef(), repo.CleanUpPullRequest)
 			m.Group("/files", func() {
-				m.Get("", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFiles)
+				m.Get("", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFilesForAllCommitsOfPr)
+				m.Get("/{sha:[a-f0-9]{7,40}}", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFilesStartingFromCommit)
+				m.Get("/{shaFrom:[a-f0-9]{7,40}}..{shaTo:[a-f0-9]{7,40}}", context.RepoRef(), repo.SetEditorconfigIfExists, repo.SetDiffViewStyle, repo.SetWhitespaceBehavior, repo.SetShowOutdatedComments, repo.ViewPullFilesForRange)
 				m.Group("/reviews", func() {
 					m.Get("/new_comment", repo.RenderNewCodeCommentForm)
 					m.Post("/comments", web.Bind(forms.CodeCommentForm{}), repo.SetShowOutdatedComments, repo.CreateCodeComment)

services/pull/pull.go

@@ -10,6 +10,7 @@ import (
 	"os"
 	"regexp"
 	"strings"
+	"time"
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/models/db"
@@ -17,7 +18,9 @@ import (
 	issues_model "code.gitea.io/gitea/models/issues"
 	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/container"
+	gitea_context "code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/graceful"
 	"code.gitea.io/gitea/modules/json"
@@ -856,3 +859,71 @@ func IsHeadEqualWithBranch(ctx context.Context, pr *issues_model.PullRequest, br
 	}
 	return baseCommit.HasPreviousCommit(headCommit.ID)
 }
+
+type CommitInfo struct {
+	Summary               string `json:"summary"`
+	CommitterOrAuthorName string `json:"committer_or_author_name"`
+	ID                    string `json:"id"`
+	ShortSha              string `json:"short_sha"`
+	Time                  string `json:"time"`
+}
+
+// GetPullCommits returns all commits on given pull request and the last review commit sha
+func GetPullCommits(ctx *gitea_context.Context, issue *issues_model.Issue) ([]CommitInfo, string, error) {
+	pull := issue.PullRequest
+
+	baseGitRepo := ctx.Repo.GitRepo
+
+	if err := pull.LoadBaseRepo(ctx); err != nil {
+		return nil, "", err
+	}
+	baseBranch := pull.BaseBranch
+	if pull.HasMerged {
+		baseBranch = pull.MergeBase
+	}
+	prInfo, err := baseGitRepo.GetCompareInfo(pull.BaseRepo.RepoPath(), baseBranch, pull.GetGitRefName(), true, false)
+	if err != nil {
+		return nil, "", err
+	}
+
+	commits := make([]CommitInfo, 0, len(prInfo.Commits))
+
+	for _, commit := range prInfo.Commits {
+		var committerOrAuthorName string
+		var commitTime time.Time
+		if commit.Committer != nil {
+			committerOrAuthorName = commit.Committer.Name
+			commitTime = commit.Committer.When
+		} else {
+			committerOrAuthorName = commit.Author.Name
+			commitTime = commit.Author.When
+		}
+
+		commits = append(commits, CommitInfo{
+			Summary:               commit.Summary(),
+			CommitterOrAuthorName: committerOrAuthorName,
+			ID:                    commit.ID.String(),
+			ShortSha:              base.ShortSha(commit.ID.String()),
+			Time:                  commitTime.Format(time.RFC3339),
+		})
+	}
+
+	var lastReviewCommitID string
+	if ctx.IsSigned {
+		// get last review of current user and store information in context (if available)
+		lastreview, err := issues_model.FindLatestReviews(ctx, issues_model.FindReviewOptions{
+			IssueID:    issue.ID,
+			ReviewerID: ctx.Doer.ID,
+			Type:       issues_model.ReviewTypeUnknown,
+		})
+
+		if err != nil && !issues_model.IsErrReviewNotExist(err) {
+			return nil, "", err
+		}
+		if len(lastreview) > 0 {
+			lastReviewCommitID = lastreview[0].CommitID
+		}
+	}
+
+	return commits, lastReviewCommitID, nil
+}

templates/repo/diff/box.tmpl

@@ -31,12 +31,32 @@
 			{{end}}
 			{{template "repo/diff/whitespace_dropdown" .}}
 			{{template "repo/diff/options_dropdown" .}}
+			{{if .PageIsPullFiles}}
+				<div id="diff-commit-select" data-issuelink="{{$.Issue.Link}}" data-queryparams="?style={{if $.IsSplitStyle}}split{{else}}unified{{end}}&whitespace={{$.WhitespaceBehavior}}&show-outdated={{$.ShowOutdatedComments}}">
+					{{/*
+						the following will be replaced by vue component
+						but this avoids any loading artifacts till the vue component is initialized
+					*/}}
+					<div class="ui jump dropdown basic button custom">
+						{{svg "octicon-git-commit"}}
+					</div>
+				</div>
+			{{end}}
 			{{if and .PageIsPullFiles $.SignedUserID (not .IsArchived)}}
 				{{template "repo/diff/new_review" .}}
 			{{end}}
 		</div>
 	</div>
 	{{if not .DiffNotAvailable}}
+		{{if and .IsShowingOnlySingleCommit .PageIsPullFiles}}
+			<div class="ui info message">
+				<div>{{.locale.Tr "repo.pulls.showing_only_single_commit" (ShortSha .BeforeCommitID)}} - <a href="{{$.Issue.Link}}/files?style={{if $.IsSplitStyle}}split{{else}}unified{{end}}&whitespace={{$.WhitespaceBehavior}}&show-outdated={{$.ShowOutdatedComments}}">{{.locale.Tr "repo.pulls.show_all_commits"}}</a></div>
+			</div>
+		{{else if and (not .IsShowingAllCommits) .PageIsPullFiles}}
+			<div class="ui info message">
+				<div>{{.locale.Tr "repo.pulls.showing_specified_commit_range" (ShortSha .BeforeCommitID) (ShortSha .AfterCommitID)}} - <a href="{{$.Issue.Link}}/files?style={{if $.IsSplitStyle}}split{{else}}unified{{end}}&whitespace={{$.WhitespaceBehavior}}&show-outdated={{$.ShowOutdatedComments}}">{{.locale.Tr "repo.pulls.show_all_commits"}}</a></div>
+			</div>
+		{{end}}
 		<script id="diff-data-script" type="module">
 			const diffDataFiles = [{{range $i, $file := .Diff.Files}}{Name:"{{$file.Name}}",NameHash:"{{$file.NameHash}}",Type:{{$file.Type}},IsBin:{{$file.IsBin}},Addition:{{$file.Addition}},Deletion:{{$file.Deletion}},IsViewed:{{$file.IsViewed}}},{{end}}];
 			const diffData = {
@@ -81,7 +101,7 @@
 					{{$isCsv := (call $.IsCsvFile $file)}}
 					{{$showFileViewToggle := or $isImage (and (not $file.IsIncomplete) $isCsv)}}
 					{{$isExpandable := or (gt $file.Addition 0) (gt $file.Deletion 0) $file.IsBin}}
-					{{$isReviewFile := and $.IsSigned $.PageIsPullFiles (not $.IsArchived)}}
+					{{$isReviewFile := and $.IsSigned $.PageIsPullFiles (not $.IsArchived) $.IsShowingAllCommits}}
 					<div class="diff-file-box diff-box file-content {{TabSizeClass $.Editorconfig $file.Name}} gt-mt-0" id="diff-{{$file.NameHash}}" data-old-filename="{{$file.OldName}}" data-new-filename="{{$file.Name}}" {{if or ($file.ShouldBeHidden) (not $isExpandable)}}data-folded="true"{{end}}>
 						<h4 class="diff-file-header sticky-2nd-row ui top attached normal header gt-df gt-ac gt-sb gt-fw">
 							<div class="diff-file-name gt-df gt-ac gt-gap-2 gt-fw">
@@ -146,7 +166,7 @@
 								{{end}}
 							</div>
 						</h4>
-						<div class="diff-file-body ui attached unstackable table segment" {{if $file.IsViewed}}data-folded="true"{{end}}>
+						<div class="diff-file-body ui attached unstackable table segment" {{if and $file.IsViewed $.IsShowingAllCommits}}data-folded="true"{{end}}>
 							<div id="diff-source-{{$file.NameHash}}" class="file-body file-code unicode-escaped code-diff{{if $.IsSplitStyle}} code-diff-split{{else}} code-diff-unified{{end}}{{if $showFileViewToggle}} gt-hidden{{end}}">
 								{{if or $file.IsIncomplete $file.IsBin}}
 									<div class="diff-file-body binary" style="padding: 5px 10px;">

templates/repo/diff/new_review.tmpl

@@ -1,9 +1,10 @@
 <div id="review-box">
-	<button class="ui tiny green button gt-pr-2 gt-df js-btn-review">
+	<button class="ui tiny green button gt-pr-2 gt-df js-btn-review {{if not $.IsShowingAllCommits}}disabled{{end}}" {{if not $.IsShowingAllCommits}}data-tooltip-content="{{$.locale.Tr "repo.pulls.review_only_possible_for_full_diff"}}"{{end}}>
 		{{.locale.Tr "repo.diff.review"}}
 		<span class="ui small label review-comments-counter" data-pending-comment-number="{{.PendingCodeCommentNumber}}">{{.PendingCodeCommentNumber}}</span>
 		{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 	</button>
+	{{if $.IsShowingAllCommits}}
 	<div class="review-box-panel tippy-target">
 		<div class="ui segment">
 			<form class="ui form form-fetch-action" action="{{.Link}}/reviews/submit" method="post">
@@ -48,4 +49,5 @@
 			</form>
 		</div>
 	</div>
+	{{end}}
 </div>

tests/gitea-repositories-meta/user2/commitsonpr.git/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/main

tests/gitea-repositories-meta/user2/commitsonpr.git/config

@@ -0,0 +1,4 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true

tests/gitea-repositories-meta/user2/commitsonpr.git/description

@@ -0,0 +1 @@
+Unnamed repository; edit this file 'description' to name the repository.

tests/gitea-repositories-meta/user2/commitsonpr.git/info/exclude

@@ -0,0 +1,6 @@
+# git ls-files --others --exclude-from=.git/info/exclude
+# Lines that start with '#' are comments.
+# For a project mostly in C, the following would be a good set of
+# exclude patterns (uncomment them if you want to use them):
+# *.[oa]
+# *~

tests/gitea-repositories-meta/user2/commitsonpr.git/info/refs

@@ -0,0 +1,3 @@
+1978192d98bb1b65e11c2cf37da854fbf94bffd6	refs/heads/branch1
+cbff181af4c9c7fee3cf6c106699e07d9a3f54e6	refs/heads/main
+1978192d98bb1b65e11c2cf37da854fbf94bffd6	refs/pull/1/head

tests/gitea-repositories-meta/user2/commitsonpr.git/logs/HEAD

@@ -0,0 +1 @@
+0000000000000000000000000000000000000000 cbff181af4c9c7fee3cf6c106699e07d9a3f54e6 Gitea <gitea@fake.local> 1688672318 +0200

tests/gitea-repositories-meta/user2/commitsonpr.git/logs/refs/heads/branch1

@@ -0,0 +1 @@
+0000000000000000000000000000000000000000 1978192d98bb1b65e11c2cf37da854fbf94bffd6 Gitea <gitea@fake.local> 1688672383 +0200	push

tests/gitea-repositories-meta/user2/commitsonpr.git/logs/refs/heads/main

@@ -0,0 +1 @@
+0000000000000000000000000000000000000000 cbff181af4c9c7fee3cf6c106699e07d9a3f54e6 root <sauer.sebastian@gmail.com> 1688672317 +0200	push

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/23/576dd018294e476c06e569b6b0f170d0558705

@@ -0,0 +1,2 @@
+x
¥ŽA
+Â0E]ç³$™´™D¼ƒ'˜If´`­´éý­OàêÁƒ÷ùež¦±
váÐUˆC©\Q;_ò<5F>™…%VÏHÆæ<C386>DS Ú»7/újPú„ÉJV³žT‚	å$>Ô®zC‹Foí1/pSáµ<C3A1>ü‚oºÀyýâ´þôõ>ñø<•yº@HÃ<48>#E8zôÞív?Ûöì¯×tmйJÝNê

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/81/1d46c7e518f4f180afb862c0db5cb8c80529ce

@@ -0,0 +1,2 @@
+x
¥<>M
+ֲ0F]ח³ֺה§<D794>	ˆx‡<78>`ׂL´`­´י‎<D799>Oאךƒ<07>דMכ²ּ\°§÷©‚c;₪R²`<60>°8Oװ«„₪<E2809E>bVִ<56>‹gפז-›¾*LװXך)<06>‚q9זּ>ה>‘÷ֲ<05>"9ךc<D79A>`װ${<7B>ו£÷ֱe<D6B1>N·<4E>נם¾ָ<C2BE>ל¦u¹‚˜j
־טM£-¶¶<C2B6>_Su¯@ז¼DLג

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/83/7d5c8125633d7d258f93b998e867eab0145520

@@ -0,0 +1,3 @@
+x
¥ŽA
+Â0E]ç³ÊL'MRñ=Á$™hÁZiÓûžÀՇǟŸÖe™+ô–NuS…àSNÄÌe(D^ƾpÒâƒFEF"²‘¡y˦¯
+Þúœ#èÄA+¾‘€­>8QreÔ‘9'#G}¬Le¯³¼`’C7¸ìßèö¾Ý™Ÿ]Z—+<2B>Áùž=Ã{DÓh;[›ö׌©ºWÍȵM

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/87/cdc1333f5f117a92f3cef78ebe0301114b3610

@@ -0,0 +1,2 @@
+x
+)JMU067`040031QrutńuŐËMa¸–ďšĎ!Ľ´E~óÓŹGŠYM…**I-.1Ô+©(axsóď­<C48F>F‡Đw‰S…îŘ%˝gS’"#°"ˬ€Ů)ýôBSć
+p·˝Ř™sŕ)’"c°˘KáS÷ď‘ö°Ě¬köžZ›xÂv¦?’"°˘é<±ŻKŐf؇ú­Z¸u"ÓĺÇľ#)2+2ý`'ž÷ě’OŰÖ3ËfEs/Z †¤Č¬¨Y×ř‰ĹĄ-+ňw5žN߬+›¸Bă4’"s°˘ŕY*Ťę¬ßKZÂú˛®ßn)ó‘d><3E>¤Č¬<>+÷–łLѲ%«DĎx,9]K*ô<>’"K°"<22>Yěđăč­»óAÂ|ŞÄ–ɉźZ
vۓG

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/c5/626fc9eff57eb1bb7b796b01d4d0f2f3f792a2

@@ -0,0 +1,2 @@
+x
ĄŽA
+Â0E]çłĘ4I3ń=Á$L´`¬4éý­OŕęÁ<C499>÷ůy­ué`ýxę›*°%L=Ó<>AEÂT˛F‹Łě)bˇŔČć-›ľ:pČZĽP"›\¶ťGŃP0—ivĘH”ŮŮűcÝ`Ö$­/ň‚YvÝŕŇľÚOßîU–ç<E28093>×z…1ÄČ:rpF‹h{śíGö׌éÚ:8ó
•ELÇ

tests/gitea-repositories-meta/user2/commitsonpr.git/objects/info/packs

@@ -0,0 +1 @@
+

tests/gitea-repositories-meta/user2/commitsonpr.git/refs/heads/branch1

@@ -0,0 +1 @@
+1978192d98bb1b65e11c2cf37da854fbf94bffd6

tests/gitea-repositories-meta/user2/commitsonpr.git/refs/heads/main

@@ -0,0 +1 @@
+cbff181af4c9c7fee3cf6c106699e07d9a3f54e6

tests/gitea-repositories-meta/user2/commitsonpr.git/refs/heads/master

@@ -0,0 +1 @@
+cbff181af4c9c7fee3cf6c106699e07d9a3f54e6

tests/gitea-repositories-meta/user2/commitsonpr.git/refs/pull/1/head

@@ -0,0 +1 @@
+1978192d98bb1b65e11c2cf37da854fbf94bffd6

tests/integration/api_issue_test.go

@@ -219,7 +219,7 @@ func TestAPISearchIssues(t *testing.T) {
 	token := getUserToken(t, "user2", auth_model.AccessTokenScopeReadIssue)
 
 	// as this API was used in the frontend, it uses UI page size
-	expectedIssueCount := 16 // from the fixtures
+	expectedIssueCount := 17 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}
@@ -243,7 +243,7 @@ func TestAPISearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.Len(t, apiIssues, 9)
+	assert.Len(t, apiIssues, 10)
 	query.Del("since")
 	query.Del("before")
 
@@ -259,15 +259,15 @@ func TestAPISearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "18", resp.Header().Get("X-Total-Count"))
+	assert.EqualValues(t, "19", resp.Header().Get("X-Total-Count"))
-	assert.Len(t, apiIssues, 18)
+	assert.Len(t, apiIssues, 19)
 
 	query.Add("limit", "10")
 	link.RawQuery = query.Encode()
 	req = NewRequest(t, "GET", link.String())
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "18", resp.Header().Get("X-Total-Count"))
+	assert.EqualValues(t, "19", resp.Header().Get("X-Total-Count"))
 	assert.Len(t, apiIssues, 10)
 
 	query = url.Values{"assigned": {"true"}, "state": {"all"}, "token": {token}}
@@ -296,7 +296,7 @@ func TestAPISearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.Len(t, apiIssues, 7)
+	assert.Len(t, apiIssues, 8)
 
 	query = url.Values{"owner": {"user3"}, "token": {token}} // organization
 	link.RawQuery = query.Encode()
@@ -317,7 +317,7 @@ func TestAPISearchIssuesWithLabels(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
 	// as this API was used in the frontend, it uses UI page size
-	expectedIssueCount := 16 // from the fixtures
+	expectedIssueCount := 17 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}

tests/integration/api_nodeinfo_test.go

@@ -33,7 +33,7 @@ func TestNodeinfo(t *testing.T) {
 		assert.True(t, nodeinfo.OpenRegistrations)
 		assert.Equal(t, "gitea", nodeinfo.Software.Name)
 		assert.Equal(t, 25, nodeinfo.Usage.Users.Total)
-		assert.Equal(t, 18, nodeinfo.Usage.LocalPosts)
+		assert.Equal(t, 19, nodeinfo.Usage.LocalPosts)
 		assert.Equal(t, 2, nodeinfo.Usage.LocalComments)
 	})
 }

tests/integration/api_repo_test.go

@@ -93,9 +93,9 @@ func TestAPISearchRepo(t *testing.T) {
 	}{
 		{
 			name: "RepositoriesMax50", requestURL: "/api/v1/repos/search?limit=50&private=false", expectedResults: expectedResults{
-				nil:   {count: 32},
+				nil:   {count: 33},
-				user:  {count: 32},
+				user:  {count: 33},
-				user2: {count: 32},
+				user2: {count: 33},
 			},
 		},
 		{

tests/integration/issue_test.go

@@ -356,7 +356,7 @@ func TestSearchIssues(t *testing.T) {
 
 	session := loginUser(t, "user2")
 
-	expectedIssueCount := 16 // from the fixtures
+	expectedIssueCount := 17 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}
@@ -377,7 +377,7 @@ func TestSearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = session.MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.Len(t, apiIssues, 9)
+	assert.Len(t, apiIssues, 10)
 	query.Del("since")
 	query.Del("before")
 
@@ -393,15 +393,15 @@ func TestSearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = session.MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "18", resp.Header().Get("X-Total-Count"))
+	assert.EqualValues(t, "19", resp.Header().Get("X-Total-Count"))
-	assert.Len(t, apiIssues, 18)
+	assert.Len(t, apiIssues, 19)
 
 	query.Add("limit", "5")
 	link.RawQuery = query.Encode()
 	req = NewRequest(t, "GET", link.String())
 	resp = session.MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.EqualValues(t, "18", resp.Header().Get("X-Total-Count"))
+	assert.EqualValues(t, "19", resp.Header().Get("X-Total-Count"))
 	assert.Len(t, apiIssues, 5)
 
 	query = url.Values{"assigned": {"true"}, "state": {"all"}}
@@ -430,7 +430,7 @@ func TestSearchIssues(t *testing.T) {
 	req = NewRequest(t, "GET", link.String())
 	resp = session.MakeRequest(t, req, http.StatusOK)
 	DecodeJSON(t, resp, &apiIssues)
-	assert.Len(t, apiIssues, 7)
+	assert.Len(t, apiIssues, 8)
 
 	query = url.Values{"owner": {"user3"}} // organization
 	link.RawQuery = query.Encode()
@@ -450,7 +450,7 @@ func TestSearchIssues(t *testing.T) {
 func TestSearchIssuesWithLabels(t *testing.T) {
 	defer tests.PrepareTestEnv(t)()
 
-	expectedIssueCount := 16 // from the fixtures
+	expectedIssueCount := 17 // from the fixtures
 	if expectedIssueCount > setting.UI.IssuePagingNum {
 		expectedIssueCount = setting.UI.IssuePagingNum
 	}

tests/integration/pull_diff_test.go

@@ -0,0 +1,58 @@
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package integration
+
+import (
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/tests"
+
+	"github.com/PuerkitoBio/goquery"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPullDiff_CompletePRDiff(t *testing.T) {
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files", false, []string{"test1.txt", "test10.txt", "test2.txt", "test3.txt", "test4.txt", "test5.txt", "test6.txt", "test7.txt", "test8.txt", "test9.txt"})
+}
+
+func TestPullDiff_SingleCommitPRDiff(t *testing.T) {
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/commits/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", true, []string{"test3.txt"})
+}
+
+func TestPullDiff_CommitRangePRDiff(t *testing.T) {
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/4ca8bcaf27e28504df7bf996819665986b01c847..23576dd018294e476c06e569b6b0f170d0558705", true, []string{"test2.txt", "test3.txt", "test4.txt"})
+}
+
+func TestPullDiff_StartingFromBaseToCommitPRDiff(t *testing.T) {
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", true, []string{"test1.txt", "test2.txt", "test3.txt"})
+}
+
+func doTestPRDiff(t *testing.T, prDiffURL string, reviewBtnDisabled bool, expectedFilenames []string) {
+	defer tests.PrepareTestEnv(t)()
+
+	session := loginUser(t, "user2")
+
+	req := NewRequest(t, "GET", "/user2/commitsonpr/pulls")
+	session.MakeRequest(t, req, http.StatusOK)
+
+	// Get the given PR diff url
+	req = NewRequest(t, "GET", prDiffURL)
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	doc := NewHTMLParser(t, resp.Body)
+
+	// Assert all files are visible.
+	fileContents := doc.doc.Find(".file-content")
+	numberOfFiles := fileContents.Length()
+
+	assert.Equal(t, len(expectedFilenames), numberOfFiles)
+
+	fileContents.Each(func(i int, s *goquery.Selection) {
+		filename, _ := s.Attr("data-old-filename")
+		assert.Equal(t, expectedFilenames[i], filename)
+	})
+
+	// Ensure the review button is enabled for full PR reviews
+	assert.Equal(t, reviewBtnDisabled, doc.doc.Find(".js-btn-review").HasClass("disabled"))
+}

web_src/css/base.css

@@ -633,6 +633,11 @@ a.label,
   color: var(--color-text-light-2);
 }
 
+.ui.dropdown > .text > .description,
+.ui.dropdown .menu > .item > .description {
+  color: var(--color-text-light-2);
+}
+
 .ui.list .list > .item .header,
 .ui.list > .item .header {
   color: var(--color-text-dark);

web_src/js/components/DiffCommitSelector.vue

@@ -0,0 +1,299 @@
+<template>
+  <div class="ui scrolling dropdown custom">
+    <button
+      class="ui basic button"
+      id="diff-commit-list-expand"
+      @click.stop="toggleMenu()"
+      :data-tooltip-content="locale.filter_changes_by_commit"
+      aria-haspopup="true"
+      tabindex="0"
+      aria-controls="diff-commit-selector-menu"
+      :aria-label="locale.filter_changes_by_commit"
+      aria-activedescendant="diff-commit-list-show-all"
+    >
+      <svg-icon name="octicon-git-commit"/>
+    </button>
+    <div class="menu left transition" id="diff-commit-selector-menu" :class="{visible: menuVisible}" v-show="menuVisible" v-cloak :aria-expanded="menuVisible ? 'true': 'false'">
+      <div class="loading-indicator is-loading" v-if="isLoading"/>
+      <div v-if="!isLoading" class="vertical item gt-df gt-fc gt-gap-2" id="diff-commit-list-show-all" role="menuitem" tabindex="-1" @keydown.enter="showAllChanges()" @click="showAllChanges()">
+        <div class="gt-ellipsis">
+          {{ locale.show_all_commits }}
+        </div>
+        <div class="gt-ellipsis text light-2 gt-mb-0">
+          {{ locale.stats_num_commits }}
+        </div>
+      </div>
+      <!-- only show the show changes since last review if there is a review AND we are commits ahead of the last review -->
+      <div
+        v-if="lastReviewCommitSha != null" role="menuitem" tabindex="-1"
+        class="vertical item gt-df gt-fc gt-gap-2 gt-border-secondary-top"
+        :class="{disabled: commitsSinceLastReview === 0}"
+        @keydown.enter="changesSinceLastReviewClick()"
+        @click="changesSinceLastReviewClick()"
+      >
+        <div class="gt-ellipsis">
+          {{ locale.show_changes_since_your_last_review }}
+        </div>
+        <div class="gt-ellipsis text light-2">
+          {{ commitsSinceLastReview }} commits
+        </div>
+      </div>
+      <span v-if="!isLoading" class="info gt-border-secondary-top text light-2">{{ locale.select_commit_hold_shift_for_range }}</span>
+      <template v-for="commit in commits" :key="commit.id">
+        <div
+          class="vertical item gt-df gt-gap-2 gt-border-secondary-top" role="menuitem" tabindex="-1"
+          :class="{selection: commit.selected, hovered: commit.hovered}"
+          @keydown.enter.exact="commitClicked(commit.id)"
+          @keydown.enter.shift.exact="commitClickedShift(commit)"
+          @mouseover.shift="highlight(commit)"
+          @click.exact="commitClicked(commit.id)"
+          @click.ctrl.exact="commitClicked(commit.id, true)"
+          @click.meta.exact="commitClicked(commit.id, true)"
+          @click.shift.exact.stop.prevent="commitClickedShift(commit)"
+        >
+          <div class="gt-f1 gt-df gt-fc gt-gap-2">
+            <div class="gt-ellipsis commit-list-summary">
+              {{ commit.summary }}
+            </div>
+            <div class="gt-ellipsis text light-2">
+              {{ commit.committer_or_author_name }}
+              <span class="text right">
+                <relative-time class="time-since" prefix="" :datetime="commit.time" data-tooltip-content data-tooltip-interactive="true">{{ commit.time }}</relative-time>
+              </span>
+            </div>
+          </div>
+          <div class="gt-mono">
+            {{ commit.short_sha }}
+          </div>
+        </div>
+      </template>
+    </div>
+  </div>
+</template>
+
+<script>
+import {SvgIcon} from '../svg.js';
+
+export default {
+  components: {SvgIcon},
+  data: () => {
+    return {
+      menuVisible: false,
+      isLoading: false,
+      locale: {},
+      commits: [],
+      hoverActivated: false,
+      lastReviewCommitSha: null
+    };
+  },
+  computed: {
+    commitsSinceLastReview() {
+      if (this.lastReviewCommitSha) {
+        return this.commits.length - this.commits.findIndex((x) => x.id === this.lastReviewCommitSha) - 1;
+      }
+      return 0;
+    },
+    queryParams() {
+      return this.$el.parentNode.getAttribute('data-queryparams');
+    },
+    issueLink() {
+      return this.$el.parentNode.getAttribute('data-issuelink');
+    }
+  },
+  mounted() {
+    document.body.addEventListener('click', this.onBodyClick);
+    this.$el.addEventListener('keydown', this.onKeyDown);
+    this.$el.addEventListener('keyup', this.onKeyUp);
+  },
+  unmounted() {
+    document.body.removeEventListener('click', this.onBodyClick);
+    this.$el.removeEventListener('keydown', this.onKeyDown);
+    this.$el.removeEventListener('keyup', this.onKeyUp);
+  },
+  methods: {
+    onBodyClick(event) {
+      // close this menu on click outside of this element when the dropdown is currently visible opened
+      if (this.$el.contains(event.target)) return;
+      if (this.menuVisible) {
+        this.toggleMenu();
+      }
+    },
+    onKeyDown(event) {
+      if (!this.menuVisible) return;
+      const item = document.activeElement;
+      if (!this.$el.contains(item)) return;
+      switch (event.key) {
+        case 'ArrowDown': // select next element
+          event.preventDefault();
+          this.focusElem(item.nextElementSibling, item);
+          break;
+        case 'ArrowUp': // select previous element
+          event.preventDefault();
+          this.focusElem(item.previousElementSibling, item);
+          break;
+        case 'Escape': // close menu
+          event.preventDefault();
+          item.tabIndex = -1;
+          this.toggleMenu();
+          break;
+      }
+    },
+    onKeyUp(event) {
+      if (!this.menuVisible) return;
+      const item = document.activeElement;
+      if (!this.$el.contains(item)) return;
+      if (event.key === 'Shift' && this.hoverActivated) {
+        // shift is not pressed anymore -> deactivate hovering and reset hovered and selected
+        this.hoverActivated = false;
+        for (const commit of this.commits) {
+          commit.hovered = false;
+          commit.selected = false;
+        }
+      }
+    },
+    highlight(commit) {
+      if (!this.hoverActivated) return;
+      const indexSelected = this.commits.findIndex((x) => x.selected);
+      const indexCurrentElem = this.commits.findIndex((x) => x.id === commit.id);
+      for (const [idx, commit] of this.commits.entries()) {
+        commit.hovered = Math.min(indexSelected, indexCurrentElem) <= idx && idx <= Math.max(indexSelected, indexCurrentElem);
+      }
+    },
+    /** Focus given element */
+    focusElem(elem, prevElem) {
+      if (elem) {
+        elem.tabIndex = 0;
+        prevElem.tabIndex = -1;
+        elem.focus();
+      }
+    },
+    /** Opens our menu, loads commits before opening */
+    async toggleMenu() {
+      this.menuVisible = !this.menuVisible;
+      // load our commits when the menu is not yet visible (it'll be toggled after loading)
+      // and we got no commits
+      if (this.commits.length === 0 && this.menuVisible && !this.isLoading) {
+        this.isLoading = true;
+        try {
+          await this.fetchCommits();
+        } finally {
+          this.isLoading = false;
+        }
+      }
+      // set correct tabindex to allow easier navigation
+      this.$nextTick(() => {
+        const expandBtn = this.$el.querySelector('#diff-commit-list-expand');
+        const showAllChanges = this.$el.querySelector('#diff-commit-list-show-all');
+        if (this.menuVisible) {
+          this.focusElem(showAllChanges, expandBtn);
+        } else {
+          this.focusElem(expandBtn, showAllChanges);
+        }
+      });
+    },
+    /** Load the commits to show in this dropdown */
+    async fetchCommits() {
+      const resp = await fetch(`${this.issueLink}/commits/list`);
+      const results = await resp.json();
+      this.commits.push(...results.commits.map((x) => {
+        x.hovered = false;
+        return x;
+      }));
+      this.commits.reverse();
+      this.lastReviewCommitSha = results.last_review_commit_sha || null;
+      if (this.lastReviewCommitSha && this.commits.findIndex((x) => x.id === this.lastReviewCommitSha) === -1) {
+        // the lastReviewCommit is not available (probably due to a force push)
+        // reset the last review commit sha
+        this.lastReviewCommitSha = null;
+      }
+      Object.assign(this.locale, results.locale);
+    },
+    showAllChanges() {
+      window.location = `${this.issueLink}/files${this.queryParams}`;
+    },
+    /** Called when user clicks on since last review */
+    changesSinceLastReviewClick() {
+      window.location = `${this.issueLink}/files/${this.lastReviewCommitSha}..${this.commits.at(-1).id}${this.queryParams}`;
+    },
+    /** Clicking on a single commit opens this specific commit */
+    commitClicked(commitId, newWindow = false) {
+      const url = `${this.issueLink}/commits/${commitId}${this.queryParams}`;
+      if (newWindow) {
+        window.open(url);
+      } else {
+        window.location = url;
+      }
+    },
+    /**
+     * When a commit is clicked with shift this enables the range
+     * selection. Second click (with shift) defines the end of the
+     * range. This opens the diff of this range
+     * Exception: first commit is the first commit of this PR. Then
+     * the diff from beginning of PR up to the second clicked commit is
+     * opened
+     */
+    commitClickedShift(commit) {
+      this.hoverActivated = !this.hoverActivated;
+      commit.selected = true;
+      // Second click -> determine our range and open links accordingly
+      if (!this.hoverActivated) {
+        // find all selected commits and generate a link
+        if (this.commits[0].selected) {
+          // first commit is selected - generate a short url with only target sha
+          const lastCommitIdx = this.commits.findLastIndex((x) => x.selected);
+          if (lastCommitIdx === this.commits.length - 1) {
+            // user selected all commits - just show the normal diff page
+            window.location = `${this.issueLink}/files${this.queryParams}`;
+          } else {
+            window.location = `${this.issueLink}/files/${this.commits[lastCommitIdx].id}${this.queryParams}`;
+          }
+        } else {
+          const start = this.commits[this.commits.findIndex((x) => x.selected) - 1].id;
+          const end = this.commits.findLast((x) => x.selected).id;
+          window.location = `${this.issueLink}/files/${start}..${end}${this.queryParams}`;
+        }
+      }
+    },
+  }
+};
+</script>
+<style scoped>
+  .hovered:not(.selection) {
+    background-color: var(--color-small-accent) !important;
+  }
+  .selection {
+    background-color: var(--color-accent) !important;
+  }
+
+  .info {
+    display: inline-block;
+    padding: 7px 14px !important;
+    line-height: 1.4;
+    width: 100%;
+  }
+
+  #diff-commit-selector-menu {
+    overflow-x: hidden;
+    max-height: 450px;
+  }
+
+  #diff-commit-selector-menu .loading-indicator {
+    height: 200px;
+    width: 350px;
+  }
+
+  #diff-commit-selector-menu .item {
+    flex-direction: row;
+    line-height: 1.4;
+    padding: 7px 14px !important;
+  }
+
+  #diff-commit-selector-menu .item:focus {
+    color: var(--color-text);
+    background: var(--color-hover);
+  }
+
+  #diff-commit-selector-menu .commit-list-summary {
+    max-width: min(380px, 96vw);
+  }
+</style>

web_src/js/features/repo-diff-commitselect.js

@@ -0,0 +1,10 @@
+import {createApp} from 'vue';
+import DiffCommitSelector from '../components/DiffCommitSelector.vue';
+
+export function initDiffCommitSelect() {
+  const el = document.getElementById('diff-commit-select');
+  if (!el) return;
+
+  const commitSelect = createApp(DiffCommitSelector);
+  commitSelect.mount(el);
+}

web_src/js/features/repo-diff.js

@@ -2,6 +2,7 @@ import $ from 'jquery';
 import {initCompReactionSelector} from './comp/ReactionSelector.js';
 import {initRepoIssueContentHistory} from './repo-issue-content.js';
 import {initDiffFileTree} from './repo-diff-filetree.js';
+import {initDiffCommitSelect} from './repo-diff-commitselect.js';
 import {validateTextareaNonEmpty} from './comp/ComboMarkdownEditor.js';
 import {initViewedCheckboxListenerFor, countAndUpdateViewedFiles, initExpandAndCollapseFilesButton} from './pull-view-file.js';
 import {initImageDiff} from './imagediff.js';
@@ -188,6 +189,7 @@ export function initRepoDiffView() {
   const diffFileList = $('#diff-file-list');
   if (diffFileList.length === 0) return;
   initDiffFileTree();
+  initDiffCommitSelect();
   initRepoDiffShowMore();
   initRepoDiffReviewButton();
   initRepoDiffFileViewToggle();

web_src/js/svg.js

@@ -29,6 +29,7 @@ import octiconFileDirectoryFill from '../../public/assets/img/svg/octicon-file-d
 import octiconFilter from '../../public/assets/img/svg/octicon-filter.svg';
 import octiconGear from '../../public/assets/img/svg/octicon-gear.svg';
 import octiconGitBranch from '../../public/assets/img/svg/octicon-git-branch.svg';
+import octiconGitCommit from '../../public/assets/img/svg/octicon-git-commit.svg';
 import octiconGitMerge from '../../public/assets/img/svg/octicon-git-merge.svg';
 import octiconGitPullRequest from '../../public/assets/img/svg/octicon-git-pull-request.svg';
 import octiconHeading from '../../public/assets/img/svg/octicon-heading.svg';
@@ -99,6 +100,7 @@ const svgs = {
   'octicon-filter': octiconFilter,
   'octicon-gear': octiconGear,
   'octicon-git-branch': octiconGitBranch,
+  'octicon-git-commit': octiconGitCommit,
   'octicon-git-merge': octiconGitMerge,
   'octicon-git-pull-request': octiconGitPullRequest,
   'octicon-heading': octiconHeading,