Returns the unique ID of the window. If the window has not yet been added to a #GtkApplication, returns 0.
Return: the unique ID for @window, or 0 if the window has not yet been added to a #GtkApplication
3.6
See Implementation
Returns the unique ID of the window. If the window has not yet been added to a #GtkApplication, returns 0.
Return: the unique ID for @window, or 0 if the window has not yet been added to a #GtkApplication