Backport PR #20148 on branch v3.4.x (FIX: MouseButton representation in boilerplate generated signatures) - #20160

Backport PR #20148 on branch v3.4.x (FIX: MouseButton representation in boilerplate generated signatures)#20160

timhoffm merged 1 commit into

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

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