Revert "Only the main window and its childs should be native widgets"

This reverts commit fe3aab2a0e.

src/qt/qt_main.cpp

@@ -176,6 +176,7 @@ main(int argc, char *argv[])
 
 #ifdef Q_OS_WINDOWS
     Q_INIT_RESOURCE(darkstyle);
+    QApplication::setAttribute(Qt::AA_NativeWindows);
 
     if (!windows_is_light_theme()) {
         QFile f(":qdarkstyle/dark/darkstyle.qss");

src/qt/qt_styleoverride.cpp

@@ -16,8 +16,6 @@
  */
 #include "qt_styleoverride.hpp"
 
-#include "qt_mainwindow.hpp"
-
 #include <QComboBox>
 #include <QAbstractItemView>
 
@@ -28,8 +26,6 @@
 #endif
 #endif
 
-extern MainWindow* main_window;
-
 int
 StyleOverride::styleHint(
     StyleHint           hint,
@@ -63,9 +59,6 @@ StyleOverride::polish(QWidget *widget)
         extern bool windows_is_light_theme();
         BOOL DarkMode = !windows_is_light_theme();
         DwmSetWindowAttribute((HWND)widget->winId(), DWMWA_USE_IMMERSIVE_DARK_MODE, (LPCVOID)&DarkMode, sizeof(DarkMode));
-        if (main_window->isAncestorOf(widget)) {
-            widget->setAttribute(Qt::WA_NativeWindow);
-        }
 #endif
     }