Fix #1623 (Filter stats update)

src/calibre/gui2/main.py

@@ -340,6 +340,8 @@ class Main(MainWindow, Ui_MainWindow):
         self.connect(self.search, SIGNAL('search(PyQt_PyObject, PyQt_PyObject)'),
                      self.tags_view.model().reinit)
         self.connect(self.library_view.model(), SIGNAL('count_changed(int)'), self.location_view.count_changed)
+        self.connect(self.library_view.model(), SIGNAL('count_changed(int)'),
+                     self.tags_view.recount)
         self.library_view.model().count_changed()
         ########################### Cover Flow ################################
         self.cover_flow = None
@@ -1129,6 +1131,7 @@ class Main(MainWindow, Ui_MainWindow):
                         os.remove(f.name)
                 except:
                     pass
+        self.tags_view.recount()
         if self.current_view() is self.library_view:
             current = self.library_view.currentIndex()
             self.library_view.model().current_changed(current, QModelIndex())

src/calibre/gui2/tags.py

@@ -7,7 +7,7 @@ __docformat__ = 'restructuredtext en'
 Browsing book collection by tags.
 '''
 from PyQt4.Qt import QAbstractItemModel, Qt, QVariant, QTreeView, QModelIndex, \
-                     QFont, SIGNAL, QSize, QColor, QIcon
+                     QFont, SIGNAL, QSize, QColor, QIcon, QPoint
 from calibre.gui2 import config
 NONE = QVariant()
 
@@ -36,6 +36,14 @@ class TagsView(QTreeView):
         if self._model.toggle(index):
             self.emit(SIGNAL('tags_marked(PyQt_PyObject, PyQt_PyObject)'), 
                       self._model.tokens(), self.match_all.isChecked())
+            
+    def recount(self, *args):
+        ci = self.currentIndex()
+        if not ci.isValid():
+            ci = self.indexAt(QPoint(10, 10))
+        self.model().refresh()
+        if ci.isValid():
+            self.scrollTo(ci, QTreeView.PositionAtTop) 
 
 class TagsModel(QAbstractItemModel):