gtkIdleAdd this function allows you to have a function called
when the event loop is idle. The difference is that you can give a
priority different from GTK_PRIORITY_DEFAULT to the idle function.
WARNING: gtk_idle_add_priority has been deprecated since version 2.4 and should not be used in newly-written code. Use gIdleAddFull() instead.
gtkIdleAddPriority(priority, fun, data = NULL)priorityG_PRIORITY_HIGH_IDLE.
Note that you will interfere with GTK+ if you use a priority above
GTK_PRIORITY_RESIZE.data