Make FloatingWindow::normalGeometry() virtual

So it can be overridden by QtQuick, since there's no "normal geometry"
for QWindow.

Also useful to workaround window manager bugs in a class derived from FloatingWindow.

src/private/FloatingWindow.cpp

@@ -606,6 +606,11 @@ void FloatingWindow::showMinimized()
     QWidgetAdapter::showMinimized();
 }
 
+QRect FloatingWindow::normalGeometry() const
+{
+    return QWidgetAdapter::normalGeometry();
+}
+
 int FloatingWindow::userType() const
 {
     if (Frame *f = singleFrame())

src/private/FloatingWindow_p.h

@@ -203,6 +203,13 @@ public:
     /// @sa QTBUG-95478
     virtual void showMinimized();
 
+    ///@brief By default equivalent to QWidget::normalGeometry()
+    /// Derived classes can implement something different here, to workaround window manager issues with Qt::Tool
+    /// Also useful for QtQuick to eventually perserve normal geometry uppon save/restore of a maximized window. As
+    /// QWindow has no notion of normal geometry, so we need to implement it here.
+    /// @sa QTBUG-95478
+    virtual QRect normalGeometry() const;
+
     ///@brief Allows the user app to specify which window flags to use, instead of KDDWs default ones
     ///Bugs caused by this won't be supported, as the amount of combinations that could go wrong can
     ///be open ended