Windows with empty buffers: `ace-window` won't show the leading characters

[xuhdev]

To reproduce, fire up Emacs, C-x 2 C-x 3 and clear the buffer contents. Now call ace-window. The leading characters are not shown. Instead, whitespace characters are highlighted.

[abo-abo]

Can't reproduce. Ace window has code to handle this specific problem. What's your Emacs version?

[xuhdev]

I'm on 24.5

[abo-abo]

Can't reproduce on 24.5 either. Can you try with emacs -Q -l ace-window.el?

[xuhdev]

I found out the issue. The following two lines in my configuration cause the misbehavior:

(global-whitespace-mode)
(setq whitespace-style '(face trailing))

These two lines highlight trailing whitespace in a buffer. Do you have any suggestions to fix it? Thanks!

[rswgnu]

One workaround for this problem is to use this feature included in the ace-window documentation:

If you want to know the window selection characters ahead of time,
turn on `ace-window-display-mode'.

It permanently displays the window labels at the left of each window's modeline and is not affected by your whitespace-mode configuration.

[rswgnu]

You could close this issue since you have added code to insert a character into empty buffers that can support the leading/overlay character. However, this presently leaves the buffer modified. You should probably change it to do an undo on the buffer or reset its modified state.

[abo-abo]

You should probably change it to do an undo on the buffer or reset its modified state.

Please PR