--- a/mercurial/dagop.py	Thu Jan 24 18:14:39 2019 +0300
+++ b/mercurial/dagop.py	Tue Jan 15 22:57:09 2019 +0800
@@ -28,7 +28,7 @@
 generatorset = smartset.generatorset
 
 # possible maximum depth between null and wdir()
-_maxlogdepth = 0x80000000
+maxlogdepth = 0x80000000
 
 def _walkrevtree(pfunc, revs, startdepth, stopdepth, reverse):
     """Walk DAG using 'pfunc' from the given 'revs' nodes
@@ -42,7 +42,7 @@
     if startdepth is None:
         startdepth = 0
     if stopdepth is None:
-        stopdepth = _maxlogdepth
+        stopdepth = maxlogdepth
     if stopdepth == 0:
         return
     if stopdepth < 0:
@@ -221,7 +221,7 @@
     Scan ends at the stopdepth (exlusive) if specified. Revisions found
     earlier than the startdepth are omitted.
     """
-    if startdepth is None and stopdepth is None:
+    if startdepth is None and (stopdepth is None or stopdepth == maxlogdepth):
         gen = _genrevdescendants(repo, revs, followfirst)
     else:
         gen = _genrevdescendantsofdepth(repo, revs, followfirst,