detect broken pyqt4.6 and recover/warn

ankiqt/ui/cardlist.py

@@ -185,10 +185,10 @@ interval, factor, noCount, priority, (select tags from facts where
 facts.id = cards.factId), (select created from facts where
 facts.id = cards.factId) from cards where id = :id""",
                                                         id=self.cards[index.row()][0])
-            # storing this in a local var first avoids a segfault
-            end = self.index(idx, 1)
+            if ankiqt.ui.utils.pyQtBroken:
+                raise
             self.emit(SIGNAL("dataChanged(QModelIndex,QModelIndex)"),
-                      index, end)
+                      index, self.index(index.row(), 1))
         except:
             # called after search changed
             pass

ankiqt/ui/main.py

@@ -1654,6 +1654,11 @@ learnt today")
         removeHook("showQuestion", self.onCardStats)
 
     def onShowGraph(self):
+        if ui.utils.pyQtBroken:
+            ui.utils.showInfo(
+                "Your PyQt installation is broken. "
+                "Please upgrade or downgrade PyQt.")
+            return
         self.setStatus(_("Loading graphs (may take time)..."))
         self.app.processEvents()
         import anki.graphs

ankiqt/ui/utils.py

@@ -264,3 +264,6 @@ class ProgressWin(object):
             self.app.processEvents()
             time.sleep(0.1)
         self.diag.cancel()
+
+import PyQt4.pyqtconfig as PyConf;
+pyQtBroken = PyConf.Configuration().pyqt_version_str.startswith("4.6")