Pass exceptions in async workers back to the main thread

libaegisub/common/dispatch.cpp

@@ -91,7 +91,15 @@ void Init(std::function<void (Thunk)> invoke_main) {
 }
 
 void Queue::Async(Thunk thunk) {
-	DoInvoke(thunk);
+	DoInvoke([=] {
+		try {
+			thunk();
+		}
+		catch (...) {
+			auto e = std::current_exception();
+			invoke_main([=] { std::rethrow_exception(e); });
+		}
+	});
 }
 
 void Queue::Sync(Thunk thunk) {

src/main.cpp

@@ -152,8 +152,13 @@ bool AegisubApp::OnInit() {
 		wxTheApp->QueueEvent(evt);
 	});
 
-	wxTheApp->Bind(EVT_CALL_THUNK, [](wxThreadEvent &evt) {
+	wxTheApp->Bind(EVT_CALL_THUNK, [this](wxThreadEvent &evt) {
+		try {
 			evt.GetPayload<std::function<void()>>()();
+		}
+		catch (...) {
+			OnExceptionInMainLoop();
+		}
 	});
 
 	config::path = new agi::Path;