Backport PR #19959 on branch v3.4.x (Bugfix Tk start_event_loop) - #20136

Backport PR #19959 on branch v3.4.x (Bugfix Tk start_event_loop)#20136

timhoffm merged 1 commit into

matplotlib:v3.4.xmatplotlib/matplotlib:v3.4.xfrom

meeseeksmachine:auto-backport-of-pr-19959-on-v3.4.xmeeseeksmachine/matplotlib:auto-backport-of-pr-19959-on-v3.4.xCopy head branch name to clipboard