[Gtk4] Clip Composite children to parent bounds#3324
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May 26, 2026
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Approved (for when master reopens) - address the nit if you agree.
In GTK3, calling gtk_widget_set_has_window(true) on a SwtFixed widget created a backing GdkWindow that automatically clipped all child widgets to the parent's allocated rectangle. GTK4 removed per-widget GdkWindows, so children render freely beyond the parent by default (GTK_OVERFLOW_VISIBLE), causing custom-drawn widgets such as CTabFolder to let their content controls draw completely outside the folder bounds.
Co-authored-by: Jonah Graham <jonah@kichwacoders.com>
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In GTK3, calling gtk_widget_set_has_window(true) on a SwtFixed widget created a backing GdkWindow that automatically clipped all child widgets to the parent's allocated rectangle. GTK4 removed per-widget GdkWindows,
so children render freely beyond the parent by default (GTK_OVERFLOW_VISIBLE), causing custom-drawn widgets such as CTabFolder to let their content controls draw completely outside the folder bounds.