Fix crash when reloading plugins and triggering subscribed events.

src/tools/ecode/plugins/formatter/formatterplugin.cpp

@@ -59,7 +59,8 @@ FormatterPlugin::~FormatterPlugin() {
 			if ( editor.first->hasDocument() )
 				editor.first->getDocument().removeCommand( kb.first );
 		}
-
+		for ( auto listener : editor.second )
+			editor.first->removeEventListener( listener );
 		editor.first->unregisterPlugin( this );
 	}
 }