describe-{function,variable} shrinks frame (GTK+/KDE)

[Stephen Berman]

With GNU Emacs 23.0.50.2 (i686-pc-linux-gnu, GTK+ Version 2.12.0) of
2007-11-13 on escher under KDE using gtk-qt engine I observe the
followin (I have not been able to reproduce this with the same Emacs
build under GNOME or twm):

1. emacs -Q ; M-: (frame-height) => 40
2. C-h i
3. C-h f RET webjump RET ; M-: (frame-height) => 40
4. C-x 1
5. C-h v RET kannada-consonant RET ; M-: (frame-height) => 39

This recipe isn't completely reliable: what seems to be constant are the
prior invocation of Info and unsplitting the windows between the
describe-* calls; otherwise, sometimes the shrinkage happens after the
first call to describe-{function,variable}, sometimes it takes several
iterations of steps 2.-5.  The function/variable names are examples,
probably any will do.  Once the shrinkage begins, it progresses with
subsequent describe-* calls.

I only noticed this recently.  My first suspicion was the changes to
help.el et al on 2007-11-06 (with-help-window etc.).  But then I tried a
build from 2007-09-23 I had saved and reproduced it with that, to my
surprise (I don't know how I could have failed to notice this behavior
before).  The latest build I still have prior to that is from
2007-08-24, just before the multi-tty merge: with this build I could not
induce the shrinkage.

Steve Berman