branchmap: preparatory indent of indent the branch rev writing code

The rev branch cache is written without a lock, we are going to fix this but we
indent the code beforehand to make the next changeset clearer.

mercurial/branchmap.py

@@ -470,6 +470,7 b' class revbranchcache(object):'
     def write(self, tr=None):
         """Save branch cache if it is dirty."""
         repo = self._repo
+        if True:
         if self._rbcnamescount < len(self._names):
             try:
                 if self._rbcnamescount != 0:
@@ -478,15 +479,18 b' class revbranchcache(object):'
                         f.write('\0')
                     else:
                         f.close()
-                        repo.ui.debug("%s changed - rewriting it\n" % _rbcnames)
+                            repo.ui.debug("%s changed - rewriting it\n"
+                                          % _rbcnames)
                         self._rbcnamescount = 0
                         self._rbcrevslen = 0
                 if self._rbcnamescount == 0:
-                    # before rewriting names, make sure references are removed
+                        # before rewriting names, make sure references are
+                        # removed
                     repo.vfs.unlinkpath(_rbcrevs, ignoremissing=True)
                     f = repo.vfs.open(_rbcnames, 'wb')
                 f.write('\0'.join(encoding.fromlocal(b)
-                                  for b in self._names[self._rbcnamescount:]))
+                                      for b in self._names[self._rbcnamescount:]
+                                      ))
                 self._rbcsnameslen = f.tell()
                 f.close()
             except (IOError, OSError, error.Abort) as inst:
@@ -497,11 +501,13 b' class revbranchcache(object):'
 
         start = self._rbcrevslen * _rbcrecsize
         if start != len(self._rbcrevs):
-            revs = min(len(repo.changelog), len(self._rbcrevs) // _rbcrecsize)
+                revs = min(len(repo.changelog),
+                           len(self._rbcrevs) // _rbcrecsize)
             try:
                 f = repo.vfs.open(_rbcrevs, 'ab')
                 if f.tell() != start:
-                    repo.ui.debug("truncating %s to %s\n" % (_rbcrevs, start))
+                        repo.ui.debug("truncating %s to %s\n"
+                                      % (_rbcrevs, start))
                     f.seek(start)
                     if f.tell() != start:
                         start = 0