Improve asynchronous filesystem event processing

- queue and batch filesystem model updates on the main thread
  - process directory-tree updates and worker-affine listeners asynchronously
  - coalesce adjacent modified events for the same path
  - preserve captured file metadata across delayed event delivery
  - add event, path, and thread-affinity filters for listener subscriptions
  - configure optimized per-plugin filesystem subscriptions
  - make listener removal wait for active callbacks safely
  - handle self-removal without deadlocking
  - support allocation-free matching of moved source paths
  - synchronize project directory-tree mutations with active searches
  - centralize diff-view button visibility around find/replace state
  - improve code editor wrap-content and scrollbar sizing
  - add queue, listener, and filesystem-model regression tests

src/tools/ecode/plugins/git/gitplugin.cpp

@@ -562,6 +562,17 @@ void GitPlugin::onFileSystemEvent( const FileEvent& ev, const FileInfo& file ) {
 	updateUI();
 }
 
+FileSystemListenerOptions GitPlugin::getFileSystemListenerOptions() const {
+	auto options = Plugin::getFileSystemListenerOptions();
+	const auto& workspace = getManager()->getWorkspaceFolder();
+	if ( !workspace.empty() ) {
+		FileSystemListenerFilter filter;
+		filter.path = workspace;
+		options.filters.emplace_back( std::move( filter ) );
+	}
+	return options;
+}
+
 void GitPlugin::displayTooltip( UICodeEditor* editor, const Git::Blame& blame,
 								const Vector2f& position ) {
 	// HACK: Gets the old font style to restore it when the tooltip is hidden