bug#23231: Modeline popup menus appear below emacs window (off sceen)

[martin rudalics <rudalics@gmx.at>]

 >>   > The further to the right the tool button is, the
 >>   > longer the distance to the tooltip becomes.
 >>
 >> To the right of what - the left edge of the display or the left edge
 >> of
 >
 > The offset is relative to the left and top edge of the display
 >
 >> the Emacs frame?  Also IIUC x- and y-offsets are affected: Are they
 >> off
 >> by the same amounts or proportional to the size of the display?
 >>
 >
 > It seems to be proportional to the display
 >
 >> What happens when you hold the Ctrl key together with a mouse click
 >> to
 >> show the Buffer or the Major Mode menus?  Are these menus off as
 >> well?
 >>
 >
 > Yes

All these indicate a problem with dpi scaling.  You might want to read
the following threads for comparison:

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20619
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21348
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=22204

Maybe you could also try the patch proposed in one of them.

 > I compiled these versions:
 > emacs-24.4	same issue
 > emacs-25.1.50	same issue
 > emacs-23.4	WORKS (but has other issues)

Thanks.  I have no idea why this should work on emacs-23.4.  What are
the "other issues" you see there?

martin