"Nested quantifiers" error in gitweb with "++" in the filename

Hi,

I'm getting an error when trying to look at a blob when the filename has "++" in it:

http://.../blob/13ec1624fefc23d20d0407aac3337b35844a2ceb:/foo-++.txt

And I get the following error page:
	gitprojects /

	500 - Internal Server Error
	Nested quantifiers in regex; marked by <-- HERE in 
m//test.git/blob/13ec1624fefc23d20d0407aac3337b35844a2ceb:/foo-++ <-- 
HERE .txt$/ at (eval 10) line 7.
	OPML TXT

The Apache log show the same thing:
  gitweb.cgi: Nested quantifiers in regex; marked by <-- HERE in 
m//test.git/blob/13ec1624fefc23d20d0407aac3337b35844a2ceb:/foo-++ <-- 
HERE .txt$/ at (eval 10) line 7.

It works fine if the filename has a single '+' sign (tried "foo-+.txt"). There is a same error when browsing a tree and clicking a directory with the "++"

We notice the error when looking at the Qt source code. They have a bunch of "*g++*" files and directories.

We use git-1.7.6 but updating to gitweb.cgi from 1.7.8.1 didn't fix it.

Regards,
	Jehan