The menus that display when clicking on various items in the mode line
(major mode, minor mode, buffer position) don't display correctly with
certain monitor setups on X, specifically when using multiple monitors
where the bottoms of the monitors are not even. They appear squished and
are effectively unusable.

FWIW, a similar issue appeared with the mode line tooltips that
displayed when hovering over these items in Emacs 24.5, but they have
since been fixed.

The menu bar menus do not suffer this problem.

When running from the command line, the following message usually
appears:

*** BUG ***
In pixman_region32_init_rect: Invalid rectangle passed
Set a breakpoint on '_pixman_log_error' to debug

I tried to debug this in gdb, but setting the breakpoint made X hang
when encountering this issue, so I was unable to procure a backtrace.

I have attached a picture showing the problem. The static displayed is
the area that I am unable to see, but is included by scrot. The squished
prompt was from clicking on `Lisp Interaction' in the mode line.