Installs a global function to be called whenever the user tries to modify the palette in a color selection. This function should save the new palette contents, and update the GtkSettings property "gtk-color-palette" so all GtkColorSelection widgets will be modified.
a function to call when the custom palette needs saving.
GtkColorSelectionChangePaletteWithScreenFunc] the previous change palette hook (that was replaced).
Derived by RGtkGen from GTK+ documentation
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