Make DockWidgetQuick::minimumSize()/max virtual

While for QtWidgets we have layouts which propagate the constraints
up, for QtQuick we don't, so we need to override minimumSize instead

src/DockWidgetQuick.cpp

@@ -87,3 +87,23 @@ bool DockWidgetQuick::event(QEvent *e)
 
     return DockWidgetBase::event(e);
 }
+
+QSize DockWidgetQuick::minimumSize() const
+{
+    if (QWidgetAdapter *guestWidget = widget()) {
+        // The guests min-size is the same as the widget's, there's no spacing or margins.
+        return guestWidget->minimumSize();
+    }
+
+    return DockWidgetBase::minimumSize();
+}
+
+QSize DockWidgetQuick::maximumSize() const
+{
+    if (QWidgetAdapter *guestWidget = widget()) {
+        // The guests max-size is the same as the widget's, there's no spacing or margins.
+        return guestWidget->maximumSize();
+    }
+
+    return DockWidgetBase::maximumSize();
+}

src/DockWidgetQuick.h

@@ -57,6 +57,12 @@ public:
     /// @reimp
     void setWidget(QWidgetOrQuick *widget) override;
 
+    /// @reimp
+    QSize minimumSize() const override;
+
+    /// @reimp
+    QSize maximumSize() const override;
+
 protected:
     bool event(QEvent *e) override;
 

src/private/quick/QWidgetAdapter_quick.cpp

@@ -234,7 +234,7 @@ void QWidgetAdapter::setMinimumSize(QSize sz)
 void QWidgetAdapter::setMaximumSize(QSize sz)
 {
     if (minimumSize() != sz) {
-        setProperty("kddockwidgets_min_size", sz);
+        setProperty("kddockwidgets_max_size", sz);
         updateGeometry();
     }
 }

src/private/quick/QWidgetAdapter_quick_p.h

@@ -99,8 +99,8 @@ public:
 
     QSize size() const { return QQuickItem::size().toSize(); }
     virtual QSize minimumSizeHint() const { return minimumSize(); }
-    QSize minimumSize() const;
-    QSize maximumSize() const;
+    virtual QSize minimumSize() const;
+    virtual QSize maximumSize() const;
     int minimumHeight() const { return minimumSize().height(); }
     int minimumWidth() const { return minimumSize().width(); }
     bool hasFixedWidth() const { return false; }

tests/tst_docks.cpp

@@ -217,6 +217,10 @@ private Q_SLOTS:
     void tst_close();
     void tst_propagateSizeHonoursMinSize();
     void tst_nonDockable();
+    void tst_floatingAction();
+    void tst_flagDoubleClick();
+    void tst_constraintsPropagateUp();
+    void tst_constraintsAfterPlaceholder();
 
     void tst_addToSmallMainWindow1();
     void tst_addToSmallMainWindow2();
@@ -236,9 +240,7 @@ private Q_SLOTS:
     void tst_restoreSimple();
     void tst_restoreSimplest();
     void tst_lastFloatingPositionIsRestored();
-    void tst_floatingAction();
-    void tst_flagDoubleClick();
-    void tst_constraintsAfterPlaceholder();
+
     void tst_minSizeChanges();
     void tst_maximumSizePolicy();
 #ifdef KDDOCKWIDGETS_QTWIDGETS
@@ -6093,6 +6095,21 @@ void TestDocks::tst_propagateSizeHonoursMinSize()
     min1 = widgetMinLength(dock1, Qt::Vertical);
     QVERIFY(dock1->height() >= min1);
 }
+void TestDocks::tst_constraintsPropagateUp()
+{
+    // Mostly for QtQuick, which doesn't have any layouts, so we need to make the propagation
+    // Manually in DockWidgetQuick::minimumSize(), in FrameQuick, etc.
+
+    EnsureTopLevelsDeleted e;
+    const int minHeight = 400;
+    auto guestWidget = new MyWidget2(QSize(400, minHeight));
+    auto dock1 = createDockWidget("dock1", guestWidget);
+    QCOMPARE(widgetMinLength(guestWidget, Qt::Vertical), minHeight);
+    QCOMPARE(dock1->minimumHeight(), minHeight);
+
+    delete dock1->window();
+
+}
 
 void TestDocks::tst_constraintsAfterPlaceholder()
 {