QmlDesigner: Icon visibility in navigator

Show alias, visibility and lock icons in the navigator only when either
checked or hovered.

Task-number: QDS-2785
Change-Id: I1eca1b9f44cfbdd839daa64849156e1c9ffa4acd
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/navigator/iconcheckboxitemdelegate.cpp

@@ -82,6 +82,12 @@ void IconCheckboxItemDelegate::paint(QPainter *painter,
                                      const QStyleOptionViewItem &styleOption,
                                      const QModelIndex &modelIndex) const
 {
+    bool isVisibilityIcon = modelIndex.column() != NavigatorTreeModel::ColumnType::Visibility;
+    // We need to invert the check status if visibility icon
+    bool checked = isVisibilityIcon ? isChecked(modelIndex) : !isChecked(modelIndex);
+    if (!(styleOption.state & QStyle::State_MouseOver) && !checked)
+        return;
+
     if (rowIsPropertyRole(modelIndex.model(), modelIndex))
         return; //Do not paint icons for property rows
 

src/plugins/qmldesigner/components/navigator/navigatortreeview.cpp

@@ -168,6 +168,7 @@ NavigatorTreeView::NavigatorTreeView(QWidget *parent)
     setMinimumWidth(240);
     setRootIsDecorated(false);
     setIndentation(indentation() * 0.5);
+    viewport()->setAttribute(Qt::WA_Hover);
 
     m_toolTipHideTimer.setSingleShot(true);
     connect(&m_toolTipHideTimer, &QTimer::timeout, [this]() {