Backport PR #24178 on branch v3.6.x (Fall back to Python-level Thread for GUI warning) - #24183

Backport PR #24178 on branch v3.6.x (Fall back to Python-level Thread for GUI warning)#24183

timhoffm merged 1 commit into

matplotlib:v3.6.xmatplotlib/matplotlib:v3.6.xfrom

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