bug#4910: 23.1.50; Error while displaying tooltip

[Dan Nicolaescu]

Juri Linkov <juri@jurta.org> writes:

  > Some recent changes broke tooltip display on non-toolkit X builds.
  > 
  > Hovering the mouse over a menu item or a toolbar icon results in the
  > error message:
  > 
  >   Error while displaying tooltip: (error Invalid frame name--not a string 
or nil)
  > 
  > and after a delay the tooltip is displayed in the echo area instead of the
  > tooltip frame.

This should be fixed.