It seems that the gtk_style_context_get_property() function has been deprecated in gtk4:
I'm having trouble locating any replacement functions in gtk4. My goal is to retrieve the border color defined by the current theme for a specific widget class and apply it to my custom widget.
With the release of GTK 4.10+, the deprecated GtkStyleContext has no direct replacement and is on track to be completely removed in GTK5. Style contexts are considered a relic from the GTK 2-to-3 transition period, provided to assist developers but not intended for long-term use as they complicate widget implementations.
To achieve a custom border rendering similar to standard GTK widgets, it is recommended to define the style in your CSS.
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