In the Keyword List:
- dragging a keyword onto another nests it there, with the keywords
below it and its photos; dropping it on the list's title (which
says "Drop here for the top level" during the drag) takes it to the
top level;
- a keyword is never outlined, nor dropped, inside itself or one of
its children;
- where a keyword of its name is already, a dialog asks before merging
the two;
- photos dragged from the grid onto a keyword get it.
The dragged keyword's name follows the pointer; the drag ends with the
button's release, wherever it is.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>