src: miscellaneous bug fixes for upcoming release

* only randomize parsing order of source files for multithreaded indexing
* fixed overview not displayed when switching projects due to MessageScrollCode being dispatched
* avoid adding duplicate TokenLocations that causes highlighting to break in QtCodeArea
* clear all controllers when switching project
* maximize unindexed file when clicking title instead of activating it

src/lib/Application.cpp

@@ -116,6 +116,8 @@ void Application::createAndLoadProject(const FilePath& projectSettingsFilePath)
 
 void Application::loadProject(const FilePath& projectSettingsFilePath)
 {
+	m_componentManager->clearComponents();
+
 	bool reparse = false;
 
 	Project::ProjectState state = m_project->load(projectSettingsFilePath);