specify window class name

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

windows/runner/main.cpp

@@ -7,7 +7,7 @@
 
 int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
                       _In_ wchar_t *command_line, _In_ int show_command) {
-  HWND hwnd = ::FindWindow(NULL, L"piliplus");
+  HWND hwnd = ::FindWindow(L"FLUTTER_RUNNER_WIN32_WINDOW", L"piliplus");
   if (hwnd != NULL) {
     ::ShowWindow(hwnd, SW_NORMAL);
     ::SetForegroundWindow(hwnd);