In a modal operator's modal() definition, the code below:
if event.type == 'MOUSEMOVE': print ("MOUSEMOVE")
will fire off and print the result whenever the mouse moves. But this code:
if event.type == 'EVT_TWEAK_L': print ("EVENT_TWEAK")
is never triggered whether I'm moving the mouse while the LMB is pressed down or not.
What is required to get a modal operator to receive a tweak event?