fixed dpi not initializing when the window shows

src/util/nativeeventhelper.hpp

@@ -1,7 +1,10 @@
 #pragma once
 
 #ifdef USEWINSDK
-#include "windows.h"
+#include <windows.h>
+#include <boost/optional.hpp>
+
+#include <QLibrary>
 
 namespace chatterino {
 namespace util {
@@ -17,7 +20,23 @@ static bool tryHandleDpiChangedMessage(void *message, int &dpi)
     }
     return false;
 }
+
+static boost::optional<UINT> getWindowDpi(quintptr ptr)
+{
+    typedef UINT(WINAPI * GetDpiForWindow)(HWND);
+    QLibrary user32("user32.dll", NULL);
+
+    GetDpiForWindow getDpiForWindow = (GetDpiForWindow)user32.resolve("GetDpiForWindow");
+
+    if (getDpiForWindow) {
+        UINT value = getDpiForWindow((HWND)ptr);
+
+        return value == 0 ? boost::none : boost::optional<UINT>(value);
+    }
+
+    return boost::none;
 }
-}
+}  // namespace util
+}  // namespace chatterino
 
 #endif