The previous implementation iterated all visible widgets on every
mouse-move event, calling get_transformed_position/size on each to
find which one was under the cursor. With a full page of items this
fires dozens of times per second on the compositor thread.
Use event.get_source() to let Clutter do its own hit-test (already
computed), then walk up the parent chain to find the owning
ClipboardItem. The walk is O(tree-depth), typically 3-4 steps,
regardless of history size.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Each ClipboardItem widget is a direct child of _itemList.
destroy_all_children() already destroys all of them. Calling
widget.destroy() on each one beforehand triggered destruction twice on
the same actor, causing spurious warnings. Drop the forEach loop and
rely solely on destroy_all_children().
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
