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During creation of an occurrence, the rectangle is not updated when the double click is on the opposite side of the cursor

This seems to be a convoluted problem. Both classes Occurrence and ZoomableGraphicsView respond to mouseDoubleClickEvent. The former performs actions only when there is no occurrence under creation. The latter:

  • computes the time associated with the position clicked and passes it to Video.set_position.
  • Video.set_position computes the position, in pixels, and passes it to ZoomableGraphicsView.set_position.
  • ZoomableGraphicsView.set_position does three things:
    1. If there is an occurrence under creation, it calls method get_time_from_bounding_interval for that occurrence. Essentially, this method limits its time argument to the feasible interval and returns the new bounded value.
    2. Do the same thing for the selected item, if it is an occurrence.
    3. Call the method Video.media_player.setPosition, passing as argument the value of time.
  • Changing the MediaPlayer position triggers the call to method Video.position_changed, which sets TimePane.time.
  • Changing the time of the TimePane causes method TimePane.on_time_changed to be called.
  • This method finally calls the methods Occurrence.update_begin_time and Occurrence.update_beginend_time, which change the appearance of the occurence rectangle.

This huge ping-pong between class can probably be improved. At any rate, the problem seems to be in method TimePane.on_time_changed.