bug#41438: [PATCH] Allow windmove keys to be bound without prefix or modifiers

[Juri Linkov]

> But there are a few general issues I noticed:
>
> 1. windmove-display-{same-window,new-{frame,tab}} can disturb regular
>    input when the modifier is set to shift or none. Possible solutions
>    could be to prohibit using these modifiers or to add a prefix key and
>    generate a warning when eg. "S-t" or "t" would be rebound.

Perhaps displaying a warning should be sufficient.

> 2. The new function windmove--unbind works with the global-map, so when
>    someone sets a prefix to none, and then changes it to something else,
>    the arrow keys are left undefined. I could either see this being
>    fixed by using a separate map or by somehow memorising what the
>    previous key was (eg. by using the property list of the windmove
>    command's symbol).

I'm not sure whether such complication is necessary.  Usually
users will try to customize the option and then restart Emacs.