diff --git a/mercurial/filemerge.py b/mercurial/filemerge.py
--- a/mercurial/filemerge.py
+++ b/mercurial/filemerge.py
@@ -217,7 +217,7 @@ def _imerge(repo, mynode, orig, fcd, fco
 
         ui = repo.ui
 
-        r = simplemerge.simplemerge(ui, a, b, c, label=labels)
+        r = simplemerge.simplemerge(ui, a, b, c, label=labels, no_minimal=True)
         return True, r
     return False, 0
 
diff --git a/tests/test-conflict.t b/tests/test-conflict.t
--- a/tests/test-conflict.t
+++ b/tests/test-conflict.t
@@ -47,13 +47,16 @@
 
   $ cat a
   Small Mathematical Series.
+  <<<<<<< local: 618808747361 - test: branch2
   1
   2
   3
-  <<<<<<< local: 618808747361 - test: branch2
   6
   8
   =======
+  1
+  2
+  3
   4
   5
   >>>>>>> other: c0c68e4fe667  - test: branch1
@@ -78,13 +81,16 @@ Verify custom conflict markers
 
   $ cat a
   Small Mathematical Series.
+  <<<<<<< local: test 2
   1
   2
   3
-  <<<<<<< local: test 2
   6
   8
   =======
+  1
+  2
+  3
   4
   5
   >>>>>>> other: test 1
@@ -105,13 +111,16 @@ Verify line splitting of custom conflict
 
   $ cat a
   Small Mathematical Series.
+  <<<<<<< local: test 2
   1
   2
   3
-  <<<<<<< local: test 2
   6
   8
   =======
+  1
+  2
+  3
   4
   5
   >>>>>>> other: test 1
@@ -145,13 +154,16 @@ Verify line trimming of custom conflict 
 
   $ cat a
   Small Mathematical Series.
+  <<<<<<< local: 123456789012345678901234567890123456789012345678901234567890\xe3\x81\x82... (esc)
   1
   2
   3
-  <<<<<<< local: 123456789012345678901234567890123456789012345678901234567890\xe3\x81\x82... (esc)
   6
   8
   =======
+  1
+  2
+  3
   4
   5
   >>>>>>> other: branch1
@@ -172,13 +184,16 @@ Verify basic conflict markers
 
   $ cat a
   Small Mathematical Series.
+  <<<<<<< local
   1
   2
   3
-  <<<<<<< local
   6
   8
   =======
+  1
+  2
+  3
   4
   5
   >>>>>>> other