bug#24579: [PATCH] borderless windows on OS X

[martin rudalics]

> This looks good indeed, but we don't have the same thing exposed to
> ELisp for GNU/Linux, do we?

We do: Emacs' native tooltip frames with a ‘border-width’ of zero should
accomplish precisely that.

> 
(https://emacs.stackexchange.com/questions/20167/how-do-i-create-a-borderless-frame
> was about this).

The recipes there don't work: The ‘border-width’ parameter is usually
ignored by the window manager for "normal" frames and replaced by the
standard border.  You have to create a CWOverrideRedirect window - a
frame that is _not_ handled by the window manager.

> Isn't that a prerequisite before merging this
> feature?

It would be.  But in fact the patch has NS still lag behind slightly
because it doesn't allow to set the border width.

martin