vim on Rnw (sweave) files: how to indent <<>>= properly?

(This question is close to one I posted yesterday on tex.stac开发者_如何转开发kexchange, but I have come to realize I should have posted it here.)

When I use Vim latex-suite to indent my .Rnw files, the Sweave blocks (e.g. a line like <<>>=) get indented (if it's following indented text, e.g. in an itemized list). Unfortunately, this "breaks" the Sweave commands, because they must start in the first column.

I have only minimal skill with Vim, and a morning of searching has not shown me how to alter my ~/.vim/indent/tex.vim (or other relevant) file to make Sweave blocks have zero indentation, but to have the latex code that follows be properly indented. Any ideas?

The update to vim's R plugin now works fine, as of yesterday.