gtk4: Implement auto-colouring of toolbar icons #27989
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Originally, the resize event happens first, adds an idle draw callback, and then the widget draws itself. Since the draw callback only happens when _idle_, it happens after the draw, so the figure appears blank. After the mouse is released, the idle draw callback fires, and the figure appears again. This is already done in the Qt backend [1], and doing so ensures the figure remains visible during resizes with the mouse. [1] https://github.com/matplotlib/matplotlib/blob/0afc5d6ca49cf6e8aa1da76b5bab0faca2f340f2/lib/matplotlib/backends/backend_qtagg.py#L25
In GTK4, colouring of symbolic icons only takes place for icons that come from an icon theme. The easiest way to replicate that is to add our own theme to the search path, but this means following the special directory layout [1], so move the -symbolic symlinks to enable that. We don't really need to change GTK3 as well, but doing so removes the need for an extra set of symlinks. https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#directory_layout
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PR summary
In GTK4, colouring of symbolic icons only takes place for icons that come from an icon theme. The easiest way to replicate that is to add our own theme to the search path, but this means following the special directory layout [1], so move the
-symbolicsymlinks to enable that.We don't really need to change GTK3 as well, but doing so removes the need for an extra set of symlinks.
https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#directory_layout
To test, you can run with
GTK_DEBUG=interactive, and in the inspector window that pops up, toggle the "Dark variant" in the Settings.PR checklist