Firefox field autocomplete drop-down menu annoying problem

Hi,

I don't know whether you encounter this problem or not, but in my case 
(Linux or FreeBSD, with ctwm and without any session manager nor 
desktop), the field autocomplete feature of firefox is very annoying as 
the drop-down menu of possible completions appears just over the field 
itself.

Digging a little, I discovered that the shift corresponds to the title 
height.

Digging a little more, and this bug appears with ctwm and sawfish but 
not fvwm...

The reason is the presence of at least one XProperty set only by fvwm, 
either _NET_FRAME_EXTENTS or
_KDE_NET_WM_FRAME_STRUT:

https://github.com/fvwmorg/fvwm/blob/master/fvwm/ewmh.c#L1213-L1218

I made a patch to make it works with ctwm too and it fixes the problem:

https://github.com/maxatome/ctwm-mirror/commit/052f7493bfc72f5437dcd014dfead307028a0618

Regards,

Max.

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