merge(third_party/git): Merge squashed git subtree at v2.23.0

Merge commit '1b593e1ea4' as 'third_party/git'

third_party/git/t/t8004-blame-with-conflicts.sh

@@ -0,0 +1,73 @@
+#!/bin/sh
+
+# Based on a test case submitted by Björn Steinbrink.
+
+test_description='git blame on conflicted files'
+. ./test-lib.sh
+
+test_expect_success 'setup first case' '
+	# Create the old file
+	echo "Old line" > file1 &&
+	git add file1 &&
+	git commit --author "Old Line <ol@localhost>" -m file1.a &&
+
+	# Branch
+	git checkout -b foo &&
+
+	# Do an ugly move and change
+	git rm file1 &&
+	echo "New line ..."  > file2 &&
+	echo "... and more" >> file2 &&
+	git add file2 &&
+	git commit --author "U Gly <ug@localhost>" -m ugly &&
+
+	# Back to master and change something
+	git checkout master &&
+	echo "
+
+bla" >> file1 &&
+	git commit --author "Old Line <ol@localhost>" -a -m file1.b &&
+
+	# Back to foo and merge master
+	git checkout foo &&
+	if git merge master; then
+		echo needed conflict here
+		exit 1
+	else
+		echo merge failed - resolving automatically
+	fi &&
+	echo "New line ...
+... and more
+
+bla
+Even more" > file2 &&
+	git rm file1 &&
+	git commit --author "M Result <mr@localhost>" -a -m merged &&
+
+	# Back to master and change file1 again
+	git checkout master &&
+	sed s/bla/foo/ <file1 >X &&
+	rm file1 &&
+	mv X file1 &&
+	git commit --author "No Bla <nb@localhost>" -a -m replace &&
+
+	# Try to merge into foo again
+	git checkout foo &&
+	if git merge master; then
+		echo needed conflict here
+		exit 1
+	else
+		echo merge failed - test is setup
+	fi
+'
+
+test_expect_success \
+	'blame runs on unconflicted file while other file has conflicts' '
+	git blame file2
+'
+
+test_expect_success 'blame does not crash with conflicted file in stages 1,3' '
+	git blame file1
+'
+
+test_done