> More good news from lwlib-Xm.c. This file used an XmNunmapCallback > instead of an XmNpopdownCallback in the menu bar because the latter > didn't work with some LessTif version. > > With current LessTif, XmNpopdownCallback works like in Motif as far as > Emacs is concerned. There's a slight difference which doesn't affect > Emacs, but might be interesting: When the the callback function is > called, its 3rd arg CALL_DATA is always null in LessTif, while it is > set to something non-null in Motif. I couldn't find out what that > argument is supposed to contain, though. I remember this part. The reason that it is NULL in LessTif is that I couldn't find out what it is supposed to be either!!! > >
