bug#43405: Tool bar item doesn't align to the right edge

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Juri Linkov <juri@linkov.net>,  43405@debbugs.gnu.org
> Date: Thu, 17 Sep 2020 11:03:46 +0200
> 
> >>>>> On Tue, 15 Sep 2020 21:39:22 +0300, Eli Zaretskii <eliz@gnu.org> said:
> 
>     Eli> In the versions of Emacs that use the so-called "external tool bar",
>     Eli> like the GTK build, I don't see how :align-to can have any effect at
>     Eli> all; we need instead to use GTK facilities to arrange the buttons
>     Eli> (assuming that such facilities exist and are available to Emacs).
> 
> The GTK code just adds items to the toolbar in order. Itʼs possible in
> GTK to specify negative positions for toolbar items, but that just
> means 'append', not 'align to right border' as far as I can see.

Thanks.

If we cannot control the placement of icons on GTK, then I guess it
makes little sense to add features to do this in our native tool bar,
since most users will be unable to take advantage of it.