revert: always display hunks reversed when reverting to parent

When reverting to the parent of working directory, operation is "discard" so
we want hunks to be presented in the same order as the diff (i.e. "reversed").
So we do not query the experimental.revertalternateinteractivemode option in
this case and always set "reversehunks" to True.

mercurial/cmdutil.py

@@ -3247,15 +3247,18 b' def _performrevert(repo, parents, ctx, a'
         diffopts = patch.difffeatureopts(repo.ui, whitespace=True)
         diffopts.nodates = True
         diffopts.git = True
-        reversehunks = repo.ui.configbool('experimental',
-                                          'revertalternateinteractivemode',
-                                          True)
+        operation = 'discard'
+        reversehunks = True
+        if node != parent:
+            operation = 'revert'
+            reversehunks = repo.ui.configbool('experimental',
+                                              'revertalternateinteractivemode',
+                                              True)
         if reversehunks:
             diff = patch.diff(repo, ctx.node(), None, m, opts=diffopts)
         else:
             diff = patch.diff(repo, None, ctx.node(), m, opts=diffopts)
         originalchunks = patch.parsepatch(diff)
-        operation = 'discard' if node == parent else 'revert'
 
         try:
 

tests/test-revert-interactive.t

@@ -380,29 +380,29 b' Check the experimental config to invert '
   3 hunks, 3 lines changed
   examine changes to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -1,5 +1,4 @@
-  -firstline
+  @@ -1,4 +1,5 @@
+  +firstline
    c
    1
    2
    3
   discard change 1/3 to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -2,7 +1,7 @@
+  @@ -1,7 +2,7 @@
    c
    1
    2
    3
-  - 3
-  +4
+  -4
+  + 3
    5
    d
   discard change 2/3 to 'folder1/g'? [Ynesfdaq?] y
   
-  @@ -7,3 +6,2 @@
+  @@ -6,2 +7,3 @@
    5
    d
-  -lastline
+  +lastline
   discard change 3/3 to 'folder1/g'? [Ynesfdaq?] n
   
   $ hg diff --nodates