--- a/hgext3rd/evolve/obshistory.py	Wed Mar 06 16:56:25 2019 +0800
+++ b/hgext3rd/evolve/obshistory.py	Wed Mar 06 21:42:32 2019 +0800
@@ -780,46 +780,6 @@
 
     return True
 
-def geteffectflag(relation):
-    """compute the effect flag by comparing the source and destination"""
-    effects = 0
-
-    source = relation[0]
-
-    for changectx in relation[1]:
-        # Check if description has changed
-        if changectx.description() != source.description():
-            effects |= DESCCHANGED
-
-        # Check if known meta has changed
-        if changectx.user() != source.user():
-            effects |= USERCHANGED
-
-        if changectx.date() != source.date():
-            effects |= DATECHANGED
-
-        if changectx.branch() != source.branch():
-            effects |= BRANCHCHANGED
-
-        # Check if other meta has changed
-        changeextra = changectx.extra().items()
-        ctxmeta = filter(ismetablacklisted, changeextra)
-
-        sourceextra = source.extra().items()
-        srcmeta = filter(ismetablacklisted, sourceextra)
-
-        if ctxmeta != srcmeta:
-            effects |= METACHANGED
-
-        # Check if at least one of the parent has changes
-        if changectx.parents() != source.parents():
-            effects |= PARENTCHANGED
-
-        if not _cmpdiff(source, changectx):
-            effects |= DIFFCHANGED
-
-    return effects
-
 def _prepare_hunk(hunk):
     """Drop all information but the username and patch"""
     cleanunk = []
@@ -838,28 +798,6 @@
         return None
     return _prepare_hunk(lines)
 
-def _cmpdiff(leftctx, rightctx):
-    """return True if both ctx introduce the "same diff"
-
-    This is a first and basic implementation, with many shortcoming.
-    """
-
-    # Leftctx or right ctx might be filtered, so we need to use the contexts
-    # with an unfiltered repository to safely compute the diff
-    leftunfi = leftctx._repo.unfiltered()[leftctx.rev()]
-    leftdiff = leftunfi.diff(git=1)
-    rightunfi = rightctx._repo.unfiltered()[rightctx.rev()]
-    rightdiff = rightunfi.diff(git=1)
-
-    left, right = (0, 0)
-    while None not in (left, right):
-        left = _getdifflines(leftdiff)
-        right = _getdifflines(rightdiff)
-
-        if left != right:
-            return False
-    return True
-
 def _getobsfate(successorssets):
     """ Compute a changeset obsolescence fate based on his successorssets.
     Successors can be the tipmost ones or the immediate ones.