[3.15] gh-50966: Fix unbounded recursion in turtle drag handlers (GH-152626)#152657
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serhiy-storchaka merged 1 commit intoJun 30, 2026
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…onGH-152626) TurtleScreenBase._update() redraws with cv.update(), which also reprocesses input events, so a handler that moves the turtle (such as screen.ondrag(turtle.goto)) reenters _update() for every queued event until the interpreter crashes. A reentrant _update() now only flushes drawing with update_idletasks(). (cherry picked from commit 6f103fab178c07cbb5f701b8ad97e275b6eb6c4c) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 30, 2026
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TurtleScreenBase._update() redraws with cv.update(), which also reprocesses
input events, so a handler that moves the turtle (such as
screen.ondrag(turtle.goto)) reenters _update() for every queued event until
the interpreter crashes. A reentrant _update() now only flushes drawing with
update_idletasks().
(cherry picked from commit 6f103fa)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: Claude Opus 4.8 noreply@anthropic.com