Remove View::maximumSize() as we already have View::maxSizeHint()

Having both was due to QWidgets having both. For QtQuick and other
frontends we only want the latter.

src/qtwidgets/views/ViewWrapper_qtwidgets.cpp

@@ -202,11 +202,6 @@ bool ViewWrapper_qtwidgets::isMinimized() const
     return m_widget->isMinimized();
 }
 
-QSize ViewWrapper_qtwidgets::maximumSize() const
-{
-    return m_widget->maximumSize();
-}
-
 void ViewWrapper_qtwidgets::setSize(int x, int y)
 {
     m_widget->resize(x, y);
@@ -387,3 +382,8 @@ SizePolicy ViewWrapper_qtwidgets::verticalSizePolicy() const
 {
     return SizePolicy(m_widget->sizePolicy().verticalPolicy());
 }
+
+QSize ViewWrapper_qtwidgets::maxSizeHint() const
+{
+    return m_widget->maximumSize();
+}

src/qtwidgets/views/ViewWrapper_qtwidgets.h

@@ -35,7 +35,6 @@ public:
     void activateWindow() override;
     bool isMaximized() const override;
     bool isMinimized() const override;
-    QSize maximumSize() const override;
     void setSize(int width, int height) override;
     bool is(Type) const override;
     std::shared_ptr<Window> window() const override;
@@ -59,6 +58,7 @@ public:
     Qt::FocusPolicy focusPolicy() const override;
     void setFocusPolicy(Qt::FocusPolicy) override;
     bool hasFocus() const override;
+    QSize maxSizeHint() const override;
     SizePolicy horizontalSizePolicy() const override;
     SizePolicy verticalSizePolicy() const override;
     QWidget *widget() const;

src/qtwidgets/views/View_qtwidgets.h

@@ -78,7 +78,7 @@ public:
         // to have a max size honoured
 
         const QSize min = minSize();
-        QSize max = maximumSize();
+        QSize max = Base::maximumSize();
         max = boundedMaxSize(min, max); // for safety against weird values
 
         const SizePolicy vPolicy = verticalSizePolicy();
@@ -93,11 +93,6 @@ public:
         return max;
     }
 
-    QSize maximumSize() const override
-    {
-        return Base::maximumSize();
-    }
-
     QRect geometry() const override
     {
         return Base::geometry();