Analysis

Unreachable code in isDisabled prevents empty dropdown items from being disabled

What fails: The isDisabled() function in EditorToolbar.vue incorrectly marks dropdown items with empty items arrays as enabled instead of disabled. The condition at line 179 uses item.items?.length in a logical AND check, which evaluates to falsy when items is an empty array, causing the entire block to be skipped.

How to reproduce:

// Create a toolbar with a dropdown that has an empty items array
const toolbar = {
  items: [
    {
      // Dropdown item with empty items array
      items: [],
      label: 'Empty Dropdown'
      // No explicit disabled property
    }
  ]
}

// Call isDisabled on the dropdown item
const item = toolbar.items[0]
isDisabled(item)  // Returns: false (incorrectly enabled)
                  // Expected: true (should be disabled)

Result: Empty dropdown returns false from isDisabled(), marking it as enabled even though there are no items to display.

Expected: A dropdown with an empty items array should be marked as disabled. The fix changes line 179 from:

if ('items' in item && item.items?.length) {

to:

if ('items' in item) {

This allows the empty items check at line 180 to execute properly and return true for empty dropdowns.

Root cause: The optional chaining operator ?. returns 0 (falsy in JavaScript) when items is an empty array []. The condition item.items?.length fails for empty arrays, preventing the block that handles empty items detection from executing.