bug#3643: emacs -Q doesn't fit on the user's screen

[jidanni]

On my 800x480 eeepc,
$ emacs -Q
ALT+F8 says the window is 21 lines high.
Since the minibuffer is below the screen, in the scratch buffer, type
(tool-bar-mode)C-x C-e
The tool bar dissapears, ALT+F8 still reports the screen is 21 lines long,
but finally all fits.
Is this an icewm bug, reporting the same size with or without toolbar?
Wait, it is counting screen lines, not pixels...
$ emacs -Q --eval '(tool-bar-mode)' #gives a window too short. ALT+F8
says it is 19 lines high.