IDLE - Fix test_editor hang on macOS with installed Python

[terryjreedy]

On my MacBook Air Catalina, Python 3.13.0a2, IDLE's test_editor hangs in IndentSearchTest.test_searcher. The problem is insert using update() instead of update_idletasks(). I added function in bpo-39885. It is called earlier in IndentAnd...Test without failure.

Linked PRs

• gh-113269: IDLE - Fix test_editor hang (macOS) #113271
• [3.12] gh-113269: IDLE - Fix test_editor hang (macOS) (GH-113271) #113272
• [3.11] gh-113269: IDLE - Fix test_editor hang (macOS) (GH-113271) #113273

[hugovk]

I think this can be closed now, please re-open if needed.