Win32: Poll only helper window messages at init

src/win32_init.c

@@ -304,6 +304,7 @@ static void createKeyTables(void)
 //
 static HWND createHelperWindow(void)
 {
+    MSG msg;
     HWND window = CreateWindowExW(WS_EX_OVERLAPPEDWINDOW,
                                   _GLFW_WNDCLASSNAME,
                                   L"GLFW helper window",
@@ -336,6 +337,12 @@ static HWND createHelperWindow(void)
                                     DEVICE_NOTIFY_WINDOW_HANDLE);
     }
 
+    while (PeekMessageW(&msg, _glfw.win32.helperWindowHandle, 0, 0, PM_REMOVE))
+    {
+        TranslateMessage(&msg);
+        DispatchMessageW(&msg);
+    }
+
    return window;
 }
 
@@ -423,8 +430,6 @@ int _glfwPlatformInit(void)
     if (!_glfw.win32.helperWindowHandle)
         return GLFW_FALSE;
 
-    _glfwPlatformPollEvents();
-
     _glfwInitTimerWin32();
     _glfwInitJoysticksWin32();