Backport PR #12016 on branch v3.0.x (Fix AttributeError in GTK3Agg backend) - #12017

Backport PR #12016 on branch v3.0.x (Fix AttributeError in GTK3Agg backend)#12017

dstansby merged 1 commit into

matplotlib:v3.0.xmatplotlib/matplotlib:v3.0.xfrom

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