fix(comments): raise edit limit to 4000 to match create (#1535) (#1544)

EditComment.Validate rejected content over 2000 chars while
AddNewComment allowed up to 4000, so users could post a comment but
not edit it. Aligns the edit cap and the matching frontend save-button
gating in ShowComment to 4000, and adds a boundary test mirroring
TestAddNewComment_AtMaxLength.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: mattwoberts

app/actions/post.go

@@ -348,8 +348,8 @@ func (action *EditComment) Validate(ctx context.Context, user *entity.User) *val
 
 	if action.Content == "" {
 		result.AddFieldFailure("content", propertyIsRequired(ctx, "comment"))
-	} else if len(action.Content) > 2000 {
-		result.AddFieldFailure("content", propertyMaxStringLen(ctx, "comment", 2000))
+	} else if len(action.Content) > 4000 {
+		result.AddFieldFailure("content", propertyMaxStringLen(ctx, "comment", 4000))
 	}
 
 	if len(action.Attachments) > 0 {

app/actions/post_test.go

@@ -158,3 +158,11 @@ func TestEditComment_TooLongContent(t *testing.T) {
 	result := action.Validate(context.Background(), nil)
 	ExpectFailed(result, "content")
 }
+
+func TestEditComment_AtMaxLength(t *testing.T) {
+	RegisterT(t)
+
+	action := &actions.EditComment{Content: strings.Repeat("a", 4000)}
+	result := action.Validate(context.Background(), nil)
+	ExpectSuccess(result)
+}

public/pages/ShowPost/components/ShowComment.tsx

@@ -232,7 +232,7 @@ export const ShowComment = (props: ShowCommentProps) => {
                   onImageUploaded={handleImageUploaded}
                 />
                 <div className="mt-2">
-                  <Button size="small" onClick={saveEdit} variant="primary" disabled={newContent.length > 2000}>
+                  <Button size="small" onClick={saveEdit} variant="primary" disabled={newContent.length > 4000}>
                     <Trans id="action.save">Save</Trans>
                   </Button>
                   <Button variant="tertiary" size="small" onClick={cancelEdit}>