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:gtk-color-palette GtkSettings property so all
GtkColorSelection widgets will be modified.
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:gtk-color-palette GtkSettings property so all GtkColorSelection widgets will be modified.