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/testdir/dumps/Test_diff_11.dump b/src/testdir/dumps/Test_diff_11.dump
new file mode 100644
index 0000000..0e4268e
--- /dev/null
+++ b/src/testdir/dumps/Test_diff_11.dump
@@ -0,0 +1,20 @@
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