bug#52986: 29.0.50; tab bar doesn't immediately show

[martin rudalics]

> I think I'm also hitting this issue just by docking Emacs to the side in
> GNOME Shell. I've set 'frame-inhibit-implied-resize' to t, but Emacs
> still wants to resize the frame when initializing tab-bar-mode.
>
> I'm currently using Emacs 29.0.50 for the new GTK/Wayland support, and I
> don't see the same issue on Emacs 28.0.91.

I checked in a fix.  Please try again with most recent master.

Thanks, martin