gtk4-prep: replace gtk_widget_set_app_paintable()-> dt_transparent_background CSS class - #21546
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TurboGit merged 1 commit intoJul 25, 2026
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…ent_background` CSS class `gtk_widget_set_app_paintable()` is removed in GTK4 with no direct replacement. The migration guide recommends CSS `background: transparent` for widgets that need transparent backgrounds. All 11 call sites across 9 files are custom-drawn widgets that handle their own painting via draw signal handlers. Replace each with the existing `dt_transparent_background` CSS class (`background-color: transparent; border: none`). Corresponds to the "Stop using gtk_widget_set_app_paintable" section of the GTK4 migration guide.
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gtk_widget_set_app_paintable()is removed in GTK4 with no direct replacement. The migration guide recommends CSSbackground: transparentfor widgets that need transparent backgrounds.All 11 call sites across 9 files are custom-drawn widgets that handle their own painting via draw signal handlers. Replace each with the existing
dt_transparent_backgroundCSS class (background-color: transparent; border: none).Related: "Stop using gtk_widget_set_app_paintable" #15920 #20433
https://docs.gtk.org/gtk4/migrating-3to4.html