Add attachment support for code review comments (#29220)

Fixes #27960, #24411, #12183

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

templates/repo/diff/box.tmpl

@@ -237,6 +237,11 @@
 					"TextareaName" "content"
 					"DropzoneParentContainer" ".ui.form"
 				)}}
+				{{if .IsAttachmentEnabled}}
+					<div class="field">
+						{{template "repo/upload" .}}
+					</div>
+				{{end}}
 				<div class="text right edit buttons">
 					<button class="ui cancel button">{{ctx.Locale.Tr "repo.issues.cancel"}}</button>
 					<button class="ui primary save button">{{ctx.Locale.Tr "repo.issues.save"}}</button>

templates/repo/diff/comment_form.tmpl

@@ -19,6 +19,12 @@
 			"DisableAutosize" "true"
 		)}}
 
+		{{if $.root.IsAttachmentEnabled}}
+			<div class="field">
+				{{template "repo/upload" $.root}}
+			</div>
+		{{end}}
+
 		<div class="field footer gt-mx-3">
 			<span class="markup-info">{{svg "octicon-markup"}} {{ctx.Locale.Tr "repo.diff.comment.markdown_info"}}</span>
 			<div class="gt-text-right">

templates/repo/diff/comments.tmpl

@@ -61,7 +61,10 @@
 			{{end}}
 			</div>
 			<div id="issuecomment-{{.ID}}-raw" class="raw-content gt-hidden">{{.Content}}</div>
-			<div class="edit-content-zone gt-hidden" data-update-url="{{$.root.RepoLink}}/comments/{{.ID}}" data-context="{{$.root.RepoLink}}"></div>
+			<div class="edit-content-zone gt-hidden" data-update-url="{{$.root.RepoLink}}/comments/{{.ID}}" data-context="{{$.root.RepoLink}}" data-attachment-url="{{$.root.RepoLink}}/comments/{{.ID}}/attachments"></div>
+			{{if .Attachments}}
+				{{template "repo/issue/view_content/attachments" dict "ctxData" $ "Attachments" .Attachments "Content" .RenderedContent}}
+			{{end}}
 		</div>
 		{{$reactions := .Reactions.GroupByType}}
 		{{if $reactions}}