fix generated source URL on rendered files (#26364)

- The permalink and 'Reference in New issue' URL of an renderable file
(those where you can see the source and a rendered version of it, such
as markdown) doesn't contain `?display=source`. This leads the issue
that the URL doesn't have any effect, as by default the rendered version
is shown and thus not the source.
- Add `?display=source` to the permalink URL and to 'Reference in New
Issue' if it's renderable file.
- Add integration testing.

Refs: https://codeberg.org/forgejo/forgejo/pulls/1088

Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-authored-by: Giteabot <teabot@gitea.io>

models/fixtures/repo_unit.yml

@@ -637,3 +637,15 @@
   repo_id: 58
   type: 5
   created_unix: 946684810
+
+-
+  id: 96
+  repo_id: 49
+  type: 1
+  created_unix: 946684810
+
+-
+  id: 97
+  repo_id: 49
+  type: 2
+  created_unix: 946684810

templates/repo/view_file.tmpl

@@ -116,10 +116,10 @@
 				</table>
 				<div class="code-line-menu ui vertical pointing menu tippy-target">
 					{{if $.Permission.CanRead $.UnitTypeIssues}}
-						<a class="item ref-in-new-issue" data-url-issue-new="{{.RepoLink}}/issues/new" data-url-param-body-link="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}" rel="nofollow noindex">{{.locale.Tr "repo.issues.context.reference_issue"}}</a>
+						<a class="item ref-in-new-issue" data-url-issue-new="{{.RepoLink}}/issues/new" data-url-param-body-link="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}{{if $.HasSourceRenderedToggle}}?display=source{{end}}" rel="nofollow noindex">{{.locale.Tr "repo.issues.context.reference_issue"}}</a>
 					{{end}}
 					<a class="item view_git_blame" href="{{.Repository.Link}}/blame/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.view_git_blame"}}</a>
-					<a class="item copy-line-permalink" data-url="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}">{{.locale.Tr "repo.file_copy_permalink"}}</a>
+					<a class="item copy-line-permalink" data-url="{{.Repository.Link}}/src/commit/{{PathEscape .CommitID}}/{{PathEscapeSegments .TreePath}}{{if $.HasSourceRenderedToggle}}?display=source{{end}}">{{.locale.Tr "repo.file_copy_permalink"}}</a>
 				</div>
 				{{end}}
 			{{end}}

tests/integration/repo_test.go

@@ -408,3 +408,39 @@ func TestMarkDownReadmeImageSubfolder(t *testing.T) {
 	assert.True(t, exists, "Image not found in markdown file")
 	assert.Equal(t, "/user2/repo1/media/branch/sub-home-md-img-check/docs/test-fake-img.jpg", src)
 }
+
+func TestGeneratedSourceLink(t *testing.T) {
+	defer tests.PrepareTestEnv(t)()
+
+	t.Run("Rendered file", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+		req := NewRequest(t, "GET", "/user2/repo1/src/branch/master/README.md?display=source")
+		resp := MakeRequest(t, req, http.StatusOK)
+		doc := NewHTMLParser(t, resp.Body)
+
+		dataURL, exists := doc.doc.Find(".copy-line-permalink").Attr("data-url")
+		assert.True(t, exists)
+		assert.Equal(t, "/user2/repo1/src/commit/65f1bf27bc3bf70f64657658635e66094edbcb4d/README.md?display=source", dataURL)
+
+		dataURL, exists = doc.doc.Find(".ref-in-new-issue").Attr("data-url-param-body-link")
+		assert.True(t, exists)
+		assert.Equal(t, "/user2/repo1/src/commit/65f1bf27bc3bf70f64657658635e66094edbcb4d/README.md?display=source", dataURL)
+	})
+
+	t.Run("Non-Rendered file", func(t *testing.T) {
+		defer tests.PrintCurrentTest(t)()
+
+		session := loginUser(t, "user27")
+		req := NewRequest(t, "GET", "/user27/repo49/src/branch/master/test/test.txt")
+		resp := session.MakeRequest(t, req, http.StatusOK)
+		doc := NewHTMLParser(t, resp.Body)
+
+		dataURL, exists := doc.doc.Find(".copy-line-permalink").Attr("data-url")
+		assert.True(t, exists)
+		assert.Equal(t, "/user27/repo49/src/commit/aacbdfe9e1c4b47f60abe81849045fa4e96f1d75/test/test.txt", dataURL)
+
+		dataURL, exists = doc.doc.Find(".ref-in-new-issue").Attr("data-url-param-body-link")
+		assert.True(t, exists)
+		assert.Equal(t, "/user27/repo49/src/commit/aacbdfe9e1c4b47f60abe81849045fa4e96f1d75/test/test.txt", dataURL)
+	})
+}