[bug-patch] Using wrong filename when adding new file

[Tim Waugh]

I reported this at savannah.gnu.org but I'm not sure if that's the
correct place.

With patch-2.6, this sequence of commands give the wrong output:

rm -rf a b 
mkdir a b 
touch a/file 
echo content > b/file.new 
diff -u a/file b/file.new > test.patch 
mkdir c 
cd c 
patch -p1 -i ../test.patch 
ls

Basically, when a unified context diff looks like:

--- a/file
+++ b/file.new
@@ -0,0 +1 @@
+content

and the patch is applied in an empty directory, the filename from the
'+++' line is used when it should be the filename from the '---' line
instead.  "a/file" is a "better" name than "b/file.new", going by the
POSIX algorithm.

This behaviour is new in patch-2.6.

Tim.
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