Backport PR #26646 on branch v3.8.x (Use standard method for closing QApp when last window is closed.) - #26652

Backport PR #26646 on branch v3.8.x (Use standard method for closing QApp when last window is closed.)#26652

QuLogic merged 1 commit into

matplotlib:v3.8.xmatplotlib/matplotlib:v3.8.xfrom

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