patch 8.1.0360: using an external diff program is slow and inflexible
Problem: Using an external diff program is slow and inflexible.
Solution: Include the xdiff library. (Christian Brabandt, closes #2732)
Use it by default.
diff --git a/src/xdiff/README.txt b/src/xdiff/README.txt
new file mode 100644
index 0000000..f77893d
--- /dev/null
+++ b/src/xdiff/README.txt
@@ -0,0 +1,14 @@
+The files in this directory come from the xdiff implementation in git.
+You can find it here: https://github.com/git/git/tree/master/xdiff
+The files were last updated 2018 September 10.
+
+This is originally based on libxdiff, which can be found here:
+http://www.xmailserver.org/xdiff-lib.html
+
+The git version was used because it has been maintained and improved.
+And since it's part of git it is expected to be reliable.
+
+The code is distributed under the GNU LGPL license. It is included in the
+COPYING file.
+
+The first work for including xdiff in Vim was done by Christian Brabandt.