ui, events: improved displaying the events window

When loading and setting the query limit configured, it was causing to
fire an unwanted combobox event, resulting in a DB query without limits,
which in turns with a lot of events was causing slowdowns when displaying
the events window.

ui/opensnitch/dialogs/stats.py

@@ -643,8 +643,10 @@ def _load_settings(self):
         if dialog_general_limit_results != None:
             # XXX: a little hack, because if the saved index is 0, the signal is not fired.
             # XXX: this causes to fire the event twice
+            self.limitCombo.blockSignals(True);
             self.limitCombo.setCurrentIndex(4)
             self.limitCombo.setCurrentIndex(int(dialog_general_limit_results))
+            self.limitCombo.blockSignals(False);
 
         rules_splitter_pos = self._cfg.getSettings(Config.STATS_RULES_SPLITTER_POS)
         if type(rules_splitter_pos) == QtCore.QByteArray: