Describes how existing data is combined with new data when
using gdk_property_change().
GDK_PROP_MODE_REPLACE
the new data replaces the existing data.
GDK_PROP_MODE_PREPEND
the new data is prepended to the existing data.
GDK_PROP_MODE_APPEND
the new data is appended to the existing data.
Describes how existing data is combined with new data when using gdk_property_change(). GDK_PROP_MODE_REPLACE the new data replaces the existing data. GDK_PROP_MODE_PREPEND the new data is prepended to the existing data. GDK_PROP_MODE_APPEND the new data is appended to the existing data.