c_gtk_color_selection_set_change_palette_with_screen_hook

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
GtkColorSelectionChangePaletteWithScreenFunc function(GtkColorSelectionChangePaletteWithScreenFunc func) c_gtk_color_selection_set_change_palette_with_screen_hook;

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