bug#48809: 28.0.50; Missing Lucid/GTK2 graphical elements on tiling WM

[martin rudalics]

> Unfortunately none of the three possibilities make a discernible
> difference with either Lucid or GTK2 (the same toolkit elements are
> still missing).

OK.  A few additional questions:

- You say "The missing elements reappear after the affected frames are
  resized."  Is resizing the only method to show such missing elements?
  Does `force-mode-line-update' in an affected frame help when its menu
  bar is missing?  What happens when you type <F10> in such a frame?

- Is the new frame in lucid-left-2.png the left or the right one?  Is
  the new frame in lucid-left-3.png the lower or the upper one?

- From your screenshots it appears as if the selected frame always
  retains focus when you do C-x 5 2.  Is that right?  If so, what
  happens if, instead of C-x 5 2, you do

  (select-frame (make-frame))

  or

  (select-frame-set-input-focus (make-frame))

- What happens when you create, in addition to an existing one, a new
  initial frame by starting a new Emacs process?  Does the new frame
  miss any of its display elements?  Is the new frame focused?

- What happens when you also enable horizontal scroll bars or the tab
  bar?

- Can you try with the Motif toolkit (Emacs 27.2 or earlier)?

- Can you try gtkparasite to inspect the GTK2 windows (I never used it
  myself).  It would be interesting whether it can find any scroll bar,
  tool bar and menu bar windows at all and if so what it can say about
  them.

So far it seems that this will become yet another "known problem".

martin