revlog: make "size" diverge from "rawsize"

Previously, revlog.size equals to revlog.rawsize. However, the flag
processor framework could make a difference - "size" could mean the length
of len(revision(raw=False)), while "rawsize" means len(revision(raw=True)).
This patch makes it so.

This corrects "hg status" output when flag processor is involved. The call
stack looks like:

  basectx.status -> workingctx._buildstatus -> workingctx._dirstatestatus
  -> workingctx._checklookup -> filectx.cmp -> filelog.cmp -> filelog.size
  -> revlog.size

mercurial/revlog.py

@@ -446,7 +446,16 b' class revlog(object):'
 
         t = self.revision(rev, raw=True)
         return len(t)
-    size = rawsize
+
+    def size(self, rev):
+        """length of non-raw text (processed by a "read" flag processor)"""
+        # fast path: if no "read" flag processor could change the content,
+        # size is rawsize. note: ELLIPSIS is known to not change the content.
+        flags = self.flags(rev)
+        if flags & (REVIDX_KNOWN_FLAGS ^ REVIDX_ELLIPSIS) == 0:
+            return self.rawsize(rev)
+
+        return len(self.revision(rev, raw=False))
 
     def chainbase(self, rev):
         base = self._chainbasecache.get(rev)

tests/test-flagprocessor.t

@@ -244,5 +244,4 b''
 # TEST: hg status
 
   $ hg status
-  M base64
   $ hg diff