Merge branch 'tr/maint-1.6.3-add-p-modeonly-fix' into maint-1.6.3

* tr/maint-1.6.3-add-p-modeonly-fix:
  add -p: do not attempt to coalesce mode changes
  git add -p: demonstrate failure when staging both mode and hunk

diff --cc git-add--interactive.perl
Simple merge

diff --cc t/t3701-add-interactive.sh
index fd2a55a5c23247c010a02513af73a93641cfb067,63940b18934d8fe71110a5a9edc60a7ee09c5f91..62fd65e18d434711176ddb1c22ef057b879e992a
--- 1/t/t3701-add-interactive.sh
--- 2/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@@ -163,14 -163,19 +163,25 @@@ test_expect_success FILEMODE 'stage mod
        git diff          file | grep "+content"
  '
  
+ 
+ test_expect_success FILEMODE 'stage mode and hunk' '
+       git reset --hard &&
+       echo content >>file &&
+       chmod +x file &&
+       printf "y\\ny\\n" | git add -p &&
+       git diff --cached file | grep "new mode" &&
+       git diff --cached file | grep "+content" &&
+       test -z "$(git diff file)"
+ '
+ 
  # end of tests disabled when filemode is not usable
  
 +test_expect_success 'setup again' '
 +      git reset --hard &&
 +      test_chmod +x file &&
 +      echo content >>file
 +'
 +
  # Write the patch file with a new line at the top and bottom
  cat >patch <<EOF
  index 180b47c..b6f2c08 100644