--- a/mercurial/graphmod.py	Wed Feb 14 00:18:35 2018 -0500
+++ b/mercurial/graphmod.py	Wed Feb 14 15:43:03 2018 +0530
@@ -454,7 +454,7 @@
     if any(len(char) > 1 for char in edgemap.values()):
         # limit drawing an edge to the first or last N lines of the current
         # section the rest of the edge is drawn like a parent line.
-        parent = state['styles'][PARENT][-1]
+        parent = state['styles'][PARENT][-1:]
         def _drawgp(char, i):
             # should a grandparent character be drawn for this line?
             if len(char) < 2:
@@ -463,7 +463,7 @@
             # either skip first num lines or take last num lines, based on sign
             return -num <= i if num < 0 else (len(lines) - i) <= num
         for i, line in enumerate(lines):
-            line[:] = [c[-1] if _drawgp(c, i) else parent for c in line]
+            line[:] = [c[-1:] if _drawgp(c, i) else parent for c in line]
         edgemap.update(
             (e, (c if len(c) < 2 else parent)) for e, c in edgemap.items())