Warning
gtk_color_selection_set_previous_color has been deprecated since version 3.4 and should not be used in newly-written code. Use gtk_color_selection_set_previous_rgba() instead.
Sets the 'previous' color to be color.
This function should be called with some hesitations,
as it might seem confusing to have that color change.
Calling gtk_color_selection_set_current_color() will also
set this color the first time it is called.
Warning gtk_color_selection_set_previous_color has been deprecated since version 3.4 and should not be used in newly-written code. Use gtk_color_selection_set_previous_rgba() instead. Sets the 'previous' color to be color. This function should be called with some hesitations, as it might seem confusing to have that color change. Calling gtk_color_selection_set_current_color() will also set this color the first time it is called.