Window numbers or characters are missing when there is no character in the window at the top left

[ackerleytng]

I'm not sure if under the hood ace-window replaces or adds a character at the top left of each window, but when a window has no character at the top-left, ace-window doesn't show any window marker for that window.

For example, if I open a window that has a completely empty file (not even one character) there is no character a the top left, and triggering ace-window doesn't produce a window marker for that window.

If a certain buffer has this file

just 13 chars

super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line super duper long line

and the window is showing the right end of the super duper long line (so that just 10 char is hidden, but is still the top most line in the window), then there is no character at the top left of the window and ace-window doesn't show a label for that window either.