Description: Emacs opens with an humongous window size (cf bug  FS#34993 )
[Note: This is the first time I report a bug, and I don't know how to add my report to the above mentioned bug instead of opening a new bug item]

I just upgraded my ArchLinux installation, and now Emacs opens up with a buggy behavior I had never seen before (in 40 years!).
The Emacs windows (called from OpenBox or from an Xterm) with something like
emacs -fn 8x13 -g 81x79
opens with (as reported in  bug 34993 ) "an almost infinite size".


Additional info:
* package version(s) emacs 24.3.1
* config and/or log files etc.


Steps to reproduce:
I investigated a bit, and, when trying to resize this "infinite window", the little text box with which X reports the current size
reports the desired size (as in the above -g option), but in PIXELS rather than characters, that is, as something like 680x1027.
However, that number must be interpreted (by X, Emacs, or the window manager---I don't know) as if it were CHARACTERS,
because one gets a window of 680x1027 characters!

If I use key F11 to execute the toggle-fullscreen command, I toggle between a correctly-sized full screen and this humongous "regular size" window.

[Please let me know how I should have reported my observations within  bug 34993 , or at any rate in a more orderly way.]