Bug report

Bug description:

First, run turtledemo clock. Then stop

When the clock stops running, the date appears, and the clear button becomes unusable. After switching to other files, the date still remains visible. Even after other files finish, pressing the clear button still cannot clear the date, but it can clear the drawings of the current file.

Linked PRs

• gh-123370: Fix the canvas not clearing after running turtledemo.clock #123457
• [3.13] gh-123370: Fix the canvas not clearing after running turtledemo.clock (gh-123457) #125653
• [3.12] [3.13] gh-123370: Fix the canvas not clearing after running turtledemo.clock (gh-123457) (GH-125653) #125656