dirstatemap: add a common `_refresh_entry` method for dirstatemap

This method is called once a DirstateItem have been modified to apply the
change on the dirstatemap if necessary.

Each variant have a different implementation (which is … the point).

We use `addfile` for the rustmap and not `set_dirstate_item` because we need to
keep the internal counter up to date and `set_dirstate_item` does not do it.

Differential Revision: https://phab.mercurial-scm.org/D11571

mercurial/dirstatemap.py

@@ -98,6 +98,9 b' class _dirstatemapcommon(object):'
         tracking in a different way.
         """
 
+    def _refresh_entry(self, f, entry):
+        """record updated state of an entry"""
+
 
 class dirstatemap(_dirstatemapcommon):
     """Map encapsulating the dirstate's contents.
@@ -381,6 +384,10 b' class dirstatemap(_dirstatemapcommon):'
 
     ### code related to manipulation of entries and copy-sources
 
+    def _refresh_entry(self, f, entry):
+        if not entry.any_tracked:
+            self._map.pop(f, None)
+
     def set_possibly_dirty(self, filename):
         """record that the current state of the file on disk is unknown"""
         self[filename].set_possibly_dirty()
@@ -770,6 +777,12 b' if rustmod is not None:'
 
         ### code related to manipulation of entries and copy-sources
 
+        def _refresh_entry(self, f, entry):
+            if not entry.any_tracked:
+                self._map.drop_item_and_copy_source(f)
+            else:
+                self._map.addfile(f, entry)
+
         def set_possibly_dirty(self, filename):
             """record that the current state of the file on disk is unknown"""
             entry = self[filename]