Specifications

Interrupting Executing Callbacks
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2 If the event at the top of the queue calls for a figure window redraw,
MATLAB performs the redraw and proceeds to the next event in the queue.
3 If the event at the top of the queue would cause a callback to execute,
MATLAB determines whether the object whose callback is suspended is
interruptible.
4 If the callback is interruptible, MATLAB executes the callback associated
with the interrupting event. If that callback contains a
drawnow, figure,
getframe, pause, or waitfor command, MATLAB repeats these steps for the
remaining events in the queue.
5 If the callback is not interruptible, MATLAB checks the BusyAction
property of the object that generated the event.
a If BusyAction is queue, MATLAB leaves the event in the event queue.
b If BusyAction is cancel, MATLAB discards the event.
6 When all events have been processed (either left in the queue, discarded, or
handled as a redraw), MATLAB resumes execution of the interrupted
callback routine.
This process continues until the callback completes execution. When MATLAB
returns the prompt to the command window, all events have been processed.