update timeline layout and frame counter, add 500ms update timer on windows to force redraw, fix animation frames export

engine/main.cpp

@@ -379,6 +379,10 @@ int main(int argc, char** argv)
     SendMessage(hWnd, WM_SETICON, ICON_SMALL,
         (LPARAM)LoadIcon(GetModuleHandle(0), MAKEINTRESOURCE(IDI_ICON1)));
 
+    SetTimer(hWnd, 1, 500, [](HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime) {
+        App::I.redraw = true;
+    });
+
     MSG msg;
     bool running = true;
     unsigned long t0 = GetTickCount();