If you decrease the size of the main window while having the output buffer open, the output buffer wont be resized with it. For example using dwm, making the window a child window and the reverting it to main. The output buffer will be double the size.
Multiple-command commands such as gcc % -o @.out; ./@.out and g++ % -o @.out; ./@.out work fine when using :Executioner, but not with :ExecutionerHorizontal and :ExecutionerVertical.