some modeline helper balloons clipped off left edge of screen

[Dan Jacobson]

Start emacs, do say C-x C-b to make the modeline full of goodies. Now
move the mouse slowly along the modeline.  Helper balloons pop up as
we move over the various items there, however, some have their
beginning words clipped off the left edge of the screen.
(C-h l shows several  <help-echo>.)
Putting the mouse on the leftmost place of the modeline works ok, but
if instead placed on the rightmost place, we see the clipping.

Also, just start emacs.  All there in the modeline is just "---GNU
Emacs---".  In this state putting the mouse on the modeline does
noting at all.