bug#22000: Patch addressing the menu-bar frame-resize interaction

[martin rudalics]

> Further testing under KDE shows three things:
>
> 1. I get a vertical scrollbar on the right for the echo
>     area/minibuffer line but not the menubar using emacs -Q on
>     unmodified emacs-26, so that was not introduced by this patch

Hmmm... Could you investigatte why this happens?  Note that the echo
area/minibuffer window by default hay a vertical scroll bar, just that
it is hidden when the window height is less than the minimum length of
the slider, see the following part of gtkutil.c:

      if (hidden)
        {
          /* No room.  Hide scroll bar as some themes output a warning if
             the height is less than the min size.  */
          gtk_widget_hide (wparent);
          gtk_widget_hide (wscroll);
        }

If you put a breakpoint at the 'if' you should see what's different
between GNOME and KDE.

> 2. In unmodified emacs-26, the line separating the menu bar from the
>     tool bar is solid, not dotted
>
> 3. I can get rid of the menu bar truncation issue by setting
>     margin-bottom to 10px

When you do that does the spearator become solid again?

> (but I still have the vertical scrollbar).

Funny.  I suppose that vertical menu bar scroll bar is of no use, that
is, you don't get any truncated items in a second row?

martin