tab completion under windows

[Jack Tanner]

I have no idea if this is an ESS bug, an R bug, or an Emacs bug, but 
it's a bug. If this is the wrong forum, I apologize -- please tell me 
where this belongs.

Under Windows GNU Emacs + ESS + R 1.9.1, I know that the current 
directory contains file foo.R.

 > source('fo<TAB>

should produce

 > source('c:/home/foo.R

but instead produces

 > c:/home/source('fo

I tried this under rterm.exe, but that does nothing when I hit tab.