test-revert: reverting no change means it's clean

This is the first step in a series that aims to put the state, not the
state transitions, in the filenames of the files generated by the
gen-revert-cases.py script. The possible state of a file in a revision
and in the working copy is only whether it exists and what its content
is (the tests don't care check flags). In the dirstate, the only state
is whether it's tracked or not. With the new naming, the file that is
currently called modified_untracked-clean now becomes
content1_content2_content2-untracked, for example.

By putting these states in the filename, it becomes easier to see that
we're not missing or duplicating any state, and to check that the
state is what we think it is. For example, the file that is currently
called missing_clean becomes missing_missing_missing-tracked and it's
clearer that it should be tracked.

Putting the content in the filename will also make the tests of file
content (e.g. "cat ../content-parent.txt") very obvious.

When we put the state in the filename, the filenames clearly need to
be unique. However, it turns out that some states are currently tested
multiple times. The 'revert' transition in the script means to take
the content from the grandparent. If the parent is the same as the
grandparent, there is no change compared to the parent, which is
exactly what 'clean' means. Avoid testing the same state twice.

tests/test-revert.t

@@ -466,8 +466,10 b' Write the python script to disk'
   > 
   > # build the combination of possible states
   > combination = []
-  > for ctxkey in ctxcontent:
+  > for ctxkey, ctxvalue in ctxcontent.iteritems():
   >     for wckey in wccontent:
+  >         if (ctxvalue[0] == ctxvalue[1] and 'revert' in wckey):
+  >             continue
   >         filename = "%s_%s" % (ctxkey, wckey)
   >         combination.append((filename, ctxkey, wckey))
   > 
@@ -517,17 +519,13 b' check list of planned files'
   clean_clean
   clean_deleted
   clean_removed
-  clean_revert
   clean_untracked-clean
-  clean_untracked-revert
   clean_untracked-wc
   clean_wc
   missing_clean
   missing_deleted
   missing_removed
-  missing_revert
   missing_untracked-clean
-  missing_untracked-revert
   missing_untracked-wc
   missing_wc
   modified_clean
@@ -575,9 +573,7 b' Generate base changeset'
   adding clean_clean
   adding clean_deleted
   adding clean_removed
-  adding clean_revert
   adding clean_untracked-clean
-  adding clean_untracked-revert
   adding clean_untracked-wc
   adding clean_wc
   adding modified_clean
@@ -600,9 +596,7 b' Generate base changeset'
   A clean_clean
   A clean_deleted
   A clean_removed
-  A clean_revert
   A clean_untracked-clean
-  A clean_untracked-revert
   A clean_untracked-wc
   A clean_wc
   A modified_clean
@@ -630,9 +624,7 b' Generate base changeset'
   base   clean_clean
   base   clean_deleted
   base   clean_removed
-  base   clean_revert
   base   clean_untracked-clean
-  base   clean_untracked-revert
   base   clean_untracked-wc
   base   clean_wc
   base   modified_clean
@@ -714,9 +706,7 b' Create parent changeset'
   base   clean_clean
   base   clean_deleted
   base   clean_removed
-  base   clean_revert
   base   clean_untracked-clean
-  base   clean_untracked-revert
   base   clean_untracked-wc
   base   clean_wc
   parent modified_clean
@@ -762,7 +752,6 b' Setup working directory'
   R added_untracked-wc
   R clean_removed
   R clean_untracked-clean
-  R clean_untracked-revert
   R clean_untracked-wc
   R modified_removed
   R modified_untracked-clean
@@ -787,7 +776,6 b' Setup working directory'
   A missing_wc
   R clean_removed
   R clean_untracked-clean
-  R clean_untracked-revert
   R clean_untracked-wc
   R modified_removed
   R modified_untracked-clean
@@ -815,9 +803,7 b' Setup working directory'
   wc     added_untracked-wc
   wc     added_wc
   base   clean_clean
-  base   clean_revert
   base   clean_untracked-clean
-  base   clean_untracked-revert
   wc     clean_untracked-wc
   wc     clean_wc
   wc     missing_untracked-wc
@@ -856,7 +842,6 b' check revert output'
   reverting clean_deleted
   undeleting clean_removed
   undeleting clean_untracked-clean
-  undeleting clean_untracked-revert
   undeleting clean_untracked-wc
   reverting clean_wc
   forgetting missing_deleted
@@ -912,7 +897,6 b' check revert output'
   reverting clean_deleted
   undeleting clean_removed
   undeleting clean_untracked-clean
-  undeleting clean_untracked-revert
   undeleting clean_untracked-wc
   reverting clean_wc
   forgetting missing_deleted
@@ -993,13 +977,8 b' revert all files individually and check '
   
   ### revert for: clean_removed
   
-  ### revert for: clean_revert
-  no changes needed to clean_revert
-  
   ### revert for: clean_untracked-clean
   
-  ### revert for: clean_untracked-revert
-  
   ### revert for: clean_untracked-wc
   
   ### revert for: clean_wc
@@ -1012,15 +991,9 b' revert all files individually and check '
   ### revert for: missing_removed
   missing_removed: no such file in rev * (glob)
   
-  ### revert for: missing_revert
-  missing_revert: no such file in rev * (glob)
-  
   ### revert for: missing_untracked-clean
   missing_untracked-clean: no such file in rev * (glob)
   
-  ### revert for: missing_untracked-revert
-  missing_untracked-revert: no such file in rev * (glob)
-  
   ### revert for: missing_untracked-wc
   file not managed: missing_untracked-wc
   
@@ -1117,13 +1090,8 b' revert all files individually and check '
   
   ### revert for: clean_removed
   
-  ### revert for: clean_revert
-  no changes needed to clean_revert
-  
   ### revert for: clean_untracked-clean
   
-  ### revert for: clean_untracked-revert
-  
   ### revert for: clean_untracked-wc
   
   ### revert for: clean_wc
@@ -1136,15 +1104,9 b' revert all files individually and check '
   ### revert for: missing_removed
   missing_removed: no such file in rev * (glob)
   
-  ### revert for: missing_revert
-  missing_revert: no such file in rev * (glob)
-  
   ### revert for: missing_untracked-clean
   missing_untracked-clean: no such file in rev * (glob)
   
-  ### revert for: missing_untracked-revert
-  missing_untracked-revert: no such file in rev * (glob)
-  
   ### revert for: missing_untracked-wc
   file not managed: missing_untracked-wc