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.
gtk_color_selection_set_change_palette_hook has been deprecated since version 2.4 and should not be used in newly-written code. This function does not work in multihead environments.
a function to call when the custom palette needs saving.
GtkColorSelectionChangePaletteFunc] the previous change palette hook (that was replaced).
Derived by RGtkGen from GTK+ documentation
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