Callback priority. Range is -32k - 32k. The lower the number, the higher the priority.
This is used to insert an event handler relative to the existing stack of sorted event handlers according to that priority. All event handlers always have a priority. If not specified Efl.Callback_Priority_Default is to be assumed.
See Efl.Callback_Priority_Before Efl.Callback_Priority_Default Efl.Callback_Priority_After
type Efl.Callback_Priority: short;
typedef short Efl_Callback_Priority;