[bug] Spectacle and screen edges not playing nicely in multi screen setup

Spectacle is a bit wreid in a multi screen setup. If you have a screen on the left which has a bigger height then your center screen, then it may happen that if you try to screenshot your entire center screen that the tools to scribble etc are moved outside of the screen bounds. This happens probably because there is still “room” below, only that room is not visible to users. Its easily evident if you take a screenshot and check all the white space which will be generated with a setup where you have screens with different heights.