MacOS X, getting wrong value for Alt-v and Shift-Alt-D

[Jan Wielemaker]

Hi,

Actually trying to fix keyboard input for SWI-Prolog's graphical subsystem
(XPCE) for the Mac, I installed rxvt-unicode 7.0 using Darwinports and 
discovered rxvt has the same bug :-(

Using a Mac ibook with Tiger (MacOS 10.4) and a US keyboard. Set the
keyboard to US-international and you have lots of extra keys using
Alt-key. Shift-Alt-D is unicode 208 (D with dash) according to the
on-board keyboard which functions well in real Apple applications. In
XPCE and rxvt though it gives I^ (206)!? Alt-v is supposed to do
composition with a diacritic, but gives the math sqrt symbol. Strangely
enough, many symbols of various codepages and characters with diacritics
work just fine.

Both XPCE and rxvt-unicode use XIM and XwcLookupString() to get keyboard
input.  Are we doing something wrong or is this	a bug in the Mac X11 input?

	Clues?

		Thanks --- Jan