context: override _dirstatestatus in workingcommitctx for correct matching
Before this patch, the result of "status()" on "workingcommitctx" may
incorrectly contain files other than ones to be committed, because
"workingctx._dirstatestatus()" returns the result of
"dirstate.status()" directly.
For correct matching, this patch overrides "_dirstatestatus" in
"workingcommitctx" and makes it return matched files only in
"self._status".
This patch uses empty list for "deleted", "unknown" and "ignored" of
status, because status between "changectx"s also makes them empty.
$ hg init
$ $PYTHON -c 'file("a", "wb").write("confuse str.splitlines\nembedded\rnewline\n")'
$ hg ci -Ama -d '1 0'
adding a
$ echo clean diff >> a
$ hg ci -mb -d '2 0'
$ hg diff -r0 -r1
diff -r 107ba6f817b5 -r 310ce7989cdc a
--- a/a Thu Jan 01 00:00:01 1970 +0000
+++ b/a Thu Jan 01 00:00:02 1970 +0000
@@ -1,2 +1,3 @@
confuse str.splitlines
embedded\r (no-eol) (esc)
newline
+clean diff