Backport PR #28451 on branch v3.9.x (Fix GTK cairo backends) backend: cairo GUI: gtk

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

matplotlib backend: agg backend: cairo backend: pdf backend: pgf backend: ps backend: svg CI: Run cibuildwheel Run wheel building tests on a PR Documentation: build building the docs Documentation: devdocs files in doc/devel GUI: gtk GUI: Qt GUI: tk GUI: wx topic: animation topic: axes topic: canvas and figure manager topic: color/color & colormaps topic: contour topic: date handling topic: figures and subfigures topic: geometry manager LayoutEngine, Constrained layout, Tight layout topic: images topic: legend topic: markers topic: mplot3d topic: path handling topic: polar topic: pyplot API topic: rcparams topic: sphinx extension topic: styles topic: table topic: text/fonts topic: text/mathtext topic: text topic: ticks axis labels topic: toolbar topic: widgets/UI

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