Uses p.break_() when repr() is used for printing

When a newline is found in the result of repr() (using the default printer), the newline is replaced with an appropriate call to p.break_()

IPython/lib/pretty.py

@@ -488,8 +488,12 b' def _default_pprint(obj, p, cycle):'
     """
     klass = getattr(obj, '__class__', None) or type(obj)
     if getattr(klass, '__repr__', None) not in _baseclass_reprs:
-        # A user-provided repr.
-        p.text(repr(obj))
+        # A user-provided repr. Find newlines and replace them with p.break_()
+        output = repr(obj)
+        for idx,output_line in enumerate(output.splitlines()):
+            if idx:
+                p.break_()
+            p.text(output_line)
         return
     p.begin_group(1, '<')
     p.pretty(klass)

IPython/lib/tests/test_pretty.py

@@ -65,6 +65,16 b' class Breaking(object):'
             p.break_()
             p.text(")")
 
+class BreakingRepr(object):
+    def __repr__(self):
+        return "Breaking(\n)"
+
+class BreakingReprParent(object):
+    def _repr_pretty_(self, p, cycle):
+        with p.group(4,"TG: ",":"):
+            p.pretty(BreakingRepr())
+
+
 
 def test_indentation():
     """Test correct indentation in groups"""
@@ -133,3 +143,11 b' def test_pprint_break():'
     output = pretty.pretty(Breaking())
     expected = "TG: Breaking(\n    ):"
     nt.assert_equal(output, expected)
+
+def test_pprint_break_repr():
+    """
+    Test that p.break_ is used in repr
+    """
+    output = pretty.pretty(BreakingReprParent())
+    expected = "TG: Breaking(\n    ):"
+    nt.assert_equal(output, expected)
  No newline at end of file