* Detect conflicts with 3way merge
Unforunately git apply --3way reports conflicts differently than standard patches
resulting in conflicts being missed.
Adjust the conflict detection code to account for this different error reporting.
Fix #18514
Signed-off-by: Andrew Thornton <art27@cantab.net>
* and three-way failed
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>