From 750b8af37bc7d6ae5f04933965e39c0e101ca06c Mon Sep 17 00:00:00 2001
From: Dave Halter <davidhalter88@gmail.com>
Date: Mon, 31 Dec 2018 01:25:11 +0100
Subject: [PATCH] Fix diff parser get_last_line calculation

---
 parso/python/diff.py     |  3 +++
 test/test_diff_parser.py | 26 ++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/parso/python/diff.py b/parso/python/diff.py
index 8a05565..57fbbb0 100644
--- a/parso/python/diff.py
+++ b/parso/python/diff.py
@@ -447,6 +447,9 @@ class _NodesTreeNode(object):
         if suffix and not suffix.endswith('\n'):
             # This is the end of a file (that doesn't end with a newline).
             line += 1
+
+        if self._node_children:
+            return max(line, self._node_children[-1].get_last_line(suffix))
         return line
 
 
diff --git a/test/test_diff_parser.py b/test/test_diff_parser.py
index dd5366f..fa4eaf2 100644
--- a/test/test_diff_parser.py
+++ b/test/test_diff_parser.py
@@ -579,3 +579,29 @@ def test_add_error_indentation(differ):
     code = 'if x:\n 1\n'
     differ.initialize(code)
     differ.parse(code + '  2\n', parsers=1, copies=0, expect_error_leaves=True)
+
+
+def test_differing_docstrings(differ):
+    code1 = dedent('''\
+        def foobar(x, y):
+            1
+            return x
+
+        def bazbiz():
+            foobar()
+        lala
+        ''')
+
+    code2 = dedent('''\
+        def foobar(x, y):
+            2
+            return x + y
+
+        def bazbiz():
+            z = foobar()
+        lala
+        ''')
+
+    differ.initialize(code1)
+    differ.parse(code2, parsers=3, copies=1)
+    differ.parse(code1, parsers=3, copies=1)