Broken since
b179b88 ("gitconfig: enable diff.mnemonicprefix",
2016-11-06).
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
====
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
[-=====-]{+====+}
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
====[-=-]
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
====[-=-]
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
[-=====-]{+====+}
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
[-=====-]{+====+}
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
[-=====-]{+====+}
-diff --git a/test.txt b/test.txt
---- a/test.txt
-+++ b/test.txt
+diff --git i/test.txt w/test.txt
+--- i/test.txt
++++ w/test.txt
@@ -1,26 +1,27 @@
Tests
[-=====-]{+====+}