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

[martin rudalics]

> Evaluating (tab-bar-mode 1) after startup,

Maybe adding a (tab-bar-lines . 1) entry to 'default-frame-alist' would
be better.  To further improve things, you could try to do that in your
early-init file.

> the tab-bar does not immediately
> appear. I must resize or bring some other (non-emacs) window in front of
> emacs in order for it to (repaint? and) display.

Does this problem also happen when you toggle 'tab-bar-mode' later?
Does toggling the menu, tool or scroll bar suffer a similar problem?

> I use a tiling window manager on Linux, not sure if that's relevant.

With a tiling window manager, set 'frame-inhibit-implied-resize' to t
unconditionally.  This should spare you lots of problems.

martin