Backport PR #27988 on branch v3.8.x (gtk: Ensure pending draws are done before GTK draw) - #27990

Backport PR #27988 on branch v3.8.x (gtk: Ensure pending draws are done before GTK draw)#27990

dstansby merged 1 commit into

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

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