[qt4] fix non displayed working directory on refreshing (closes #137714)

1      def indexFromRev(self, rev):
2          self.ensureBuilt(rev=rev)
3          row = self.rowFromRev(rev)
4          if row is not None:
5              return self.index(row, 0)
6 -        return None
7 
8  class FileRevModel(HgRepoListModel):
9      """
10      Model used to manage the list of revisions of a file, in file
11      viewer of in diff-file viewer dialogs.

12                  pass
13          wc = self.repo[None]
14          idx = tv.model().index(0, 0) # Working directory or tip
15          if not wc.dirty() and wc.p1().rev() >= 0:
16              # parent of working directory is not nullrev
17 -            idx = tv.model().indexFromRev(wc.p1().rev())
18 +            _idx = tv.model().indexFromRev(wc.p1().rev())
19 +            # may appears if wc has been filtered out
20 +            # (for example not on the filtered branch)
21 +            if _idx is not None:
22 +                idx = _idx
23          tv.setCurrentIndex(idx)
24 
25      def revision_activated(self, rev=None):
26          """
27          Callback called when a revision is double-clicked in the revisions table