gtk4-rs
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a11y: Align to gtk breaking change in AccessibleValue errormessage relation
We recently had to break public API of GtkAccessibleValue in gtk because it was ambiguous, and not aligned to the W3C-ARIA spec.
https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/7528
We still use this API in the previously documented way from gtk-rs that caused a runtime crash in gtk until now. It should be changed to use a list relation, not a single reference. This should be possible to do in a point release, because right now it just reliably crashes the app whenever it's used.
Opening this issue so that I don't forget about this, I'll fix it myself.