Fix #2807 ("Reset Quick Search" button does not reset the status of the tag toggle switches)

src/calibre/gui2/library.py

@@ -1128,6 +1128,7 @@ class SearchBox(QLineEdit):
         self.home(False)
         self.initial_state = True
         self.setStyleSheet("background-color: white")
+        self.emit(SIGNAL('cleared()'))
 
     def clear(self):
         self.clear_to_help()

src/calibre/gui2/main.py

@@ -456,6 +456,7 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
                 SIGNAL('count_changed(int)'), self.location_view.count_changed)
         self.connect(self.library_view.model(), SIGNAL('count_changed(int)'),
                      self.tags_view.recount)
+        self.connect(self.search, SIGNAL('cleared()'), self.tags_view.clear)
         self.library_view.model().count_changed()
         ########################### Cover Flow ################################
         self.cover_flow = None

src/calibre/gui2/tag_view.py

@@ -36,6 +36,9 @@ class TagsView(QTreeView):
             self.emit(SIGNAL('tags_marked(PyQt_PyObject, PyQt_PyObject)'),
                       self._model.tokens(), self.match_all.isChecked())
 
+    def clear(self):
+        self.model().clear_state()
+
     def recount(self, *args):
         ci = self.currentIndex()
         if not ci.isValid():
@@ -119,6 +122,11 @@ class TagsModel(QStandardItemModel):
                 self._data[category], self.cmap[r], self.bold_font, self.icon_map))
         #self.reset()
 
+    def clear_state(self):
+        for category in self._data.values():
+            for tag in category:
+                tag.state = 0
+        self.refresh()
 
     def reinit(self, *args, **kwargs):
         if not self.ignore_next_search: