Testing in Mac OS X (El Capitan) at 1344x756 resolution, bottom of window was hiding behind application tray, I minimized app tray and attempted to adjust window size bottom to sit above app tray but was unable to make horizontal adjustments to window size... only vertical works.
I found it easier to show via video instead of an image. You can see a video of the behavior here: https://drive.google.com/open?id=0Byl4WJ14HvorRGJDaVY4OXJMNk0
In the video you can see me grab the bottom right corner of the minimized window and attempt to adjust it but only the vertical side adjusts and the horizontal side does not. I also demo the cursor grabbing the bottom of the window and attempting a horizontal adjust upwards and nothing happens.