patch: upgrade to git patch when removing binary file

Otherwise it may cause data loss when removing binary files in mq with
--git=auto.

mercurial/patch.py

@@ -1588,7 +1588,7 b' def trydiff(repo, revs, ctx1, ctx2, modi'
                     else:
                         header.append('deleted file mode %s\n' %
                                       gitmode[man1.flags(f)])
-                elif not to:
+                elif not to or util.binary(to):
                     # regular diffs cannot represent empty file deletion
                     losedatafn(f)
             else:

tests/test-diff-upgrade

@@ -43,10 +43,10 b' hg autodiff --git=no'
 echo '% git=no: git diff for single regular file'
 hg autodiff --git=yes regular
 
-echo '% git=auto: regular diff for regular files and removals'
-hg autodiff --git=auto regular newregular rmregular rmbinary rmexec
+echo '% git=auto: regular diff for regular files and non-binary removals'
+hg autodiff --git=auto regular newregular rmregular rmexec
 
-for f in exec newexec setexec unsetexec binary newbinary newempty rmempty; do
+for f in exec newexec setexec unsetexec binary newbinary newempty rmempty rmbinary; do
     echo '% git=auto: git diff for' $f
     hg autodiff --git=auto $f
 done

tests/test-diff-upgrade.out

@@ -62,7 +62,7 b' diff --git a/regular b/regular'
 @@ -1,1 +1,2 @@
  regular
 +regular
-% git=auto: regular diff for regular files and removals
+% git=auto: regular diff for regular files and non-binary removals
 diff -r b3f053cd7c7f newregular
 --- /dev/null
 +++ b/newregular
@@ -74,8 +74,6 b' diff -r b3f053cd7c7f regular'
 @@ -1,1 +1,2 @@
  regular
 +regular
-diff -r b3f053cd7c7f rmbinary
-Binary file rmbinary has changed
 diff -r b3f053cd7c7f rmexec
 --- a/rmexec
 +++ /dev/null
@@ -129,6 +127,10 b' new file mode 100644'
 % git=auto: git diff for rmempty
 diff --git a/rmempty b/rmempty
 deleted file mode 100644
+% git=auto: git diff for rmbinary
+diff --git a/rmbinary b/rmbinary
+deleted file mode 100644
+Binary file rmbinary has changed
 % git=warn: regular diff with data loss warnings
 diff -r b3f053cd7c7f binary
 Binary file binary has changed
@@ -172,6 +174,7 b' data lost for: binary'
 data lost for: newbinary
 data lost for: newempty
 data lost for: newexec
+data lost for: rmbinary
 data lost for: rmempty
 data lost for: setexec
 data lost for: unsetexec