Summary

When a user selects only immutable tags in the new UI and attempts to delete them, the UI displays a blank green success notification (empty title) instead of an informative message explaining that no tags were deleted because all selected tags are immutable.

Root Cause Analysis

Flow:

1. User selects only immutable tags in TagsToolbar
2. TagsToolbar filters out immutable tags: selectedMutableTags = [] (lines 53-62)
3. DeleteModal receives empty props.tags array (line 255-256)
4. bulkDeleteTags([]) succeeds (no operations attempted, no errors thrown)
5. Success handler executes useEffect (lines 32-65)
6. Switch statement has NO case for props.tags.length === 0
7. alert.title remains empty string ""
8. User sees blank notification with green checkmark

Affected Code Files:

• web/src/routes/RepositoryDetails/Tags/DeleteModal.tsx (lines 32-65) - Success handler missing edge case
• web/src/routes/RepositoryDetails/Tags/TagsToolbar.tsx (lines 53-62, 255-256) - Filters immutable tags
• web/src/resources/TagResource.ts (lines 269-296) - Returns success for empty array

Reproduction Steps

1. Navigate to repository with immutable tags
2. Select ONLY immutable tags (e.g., tags matching immutability policy pattern)
3. Click "Actions" → "Delete Tags"
4. Click "Delete" in confirmation modal
5. Observe: Blank green notification appears (no title text)

Expected Behavior

User should see a warning notification:

Title: No tags deleted
Message: All selected tags are immutable and cannot be deleted: tag1, tag2, tag3

Actual Behavior

User sees a blank green success notification with no title text.

Impact

User Experience:

• Confusing blank notification
• No feedback about why deletion "succeeded" without deleting anything
• Users may think there's a UI bug or data loss

Severity: Medium

• Affects usability for repositories with immutability policies
• Does not cause data loss or security issues
• Cosmetic/UX issue

Related Features

• Immutability policies (namespace and repository level)
• Tag bulk operations
• PatternFly alert notifications