log: display closing-branch nodes as "_" (BC) In plain `hg log` there is no indication that a commit closes a branch. You can use hg log --debug, but this is too verbose. A simple idea copied from thg and other graphical viewers is to display the node for a closing-branch commit as a horizontal line. I think this technically is a BC if we consider the graphlog to be part of the stdout API, but I really can't imagine who the hell is parsing the graphlog to determine information about commits.

--- a/mercurial/cmdutil.py	Fri Mar 06 17:00:42 2015 -0600
+++ b/mercurial/cmdutil.py	Mon Nov 24 16:42:49 2014 -0500
@@ -1915,6 +1915,8 @@
             char = '@'
         elif ctx.obsolete():
             char = 'x'
+        elif ctx.closesbranch():
+            char = '_'
         copies = None
         if getrenamed and ctx.rev():
             copies = []