bug#43672: 28.0.50; select-frame-set-input-focus does not set focus first time called

[martin rudalics]

> I can't say why, but today this works fine with my "normal emacs"; with
> all packages loaded and running as server/client.
>
> When I start with emacs -Q then it does not work; it needs two calls to
> select-frame-set-input-focus.

That is, you can interleave normal and -Q sessions and in the normal
session "this works" and in the -Q session it doesn't?  Then I'm afraid
that you have to bisect the things you do in your normal session to find
out what makes "this work".

> I thought it might have something to do with focus and how WM raises
> windows and gives focus; normally I have focus follow mouse but not auto
> raising enabled. I have disabled auto-focus (need click into window to
> give focus) but I see no difference in behaviour.

By design, auto-focus should only affect mouse movements.  One recurring
problem is, however, whether the WM should auto-move the mouse pointer
to a freshly displayed window in order to make sure that if the mouse
pointer was located on another window, that window would not regain
focus immediately due to your auto-focus settings.  Note that that
window _should_ retain focus when you specified 'no-focus-on-map' for
the new frame but IIUC you did not do that.

martin