TreeModel: Introduce a recursive TreeItem::updateAll() function

Useful in cases where e.g. siblings are affected (e.g. font
changes to indicate active items).

Change-Id: Ib2f8018688d00bd682bb6aaff08156f0be04f5dc
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/treemodel.cpp

@@ -730,6 +730,16 @@ void TreeItem::update()
     }
 }
 
+void TreeItem::updateAll()
+{
+    if (m_model) {
+        QModelIndex idx = index();
+        m_model->dataChanged(idx, idx.sibling(idx.row(), m_model->m_columnCount - 1));
+        foreach (TreeItem *item, m_children)
+            item->updateAll();
+    }
+}
+
 void TreeItem::updateColumn(int column)
 {
     if (m_model) {

src/libs/utils/treemodel.h

@@ -57,6 +57,7 @@ public:
     void removeChildren();
     void sortChildren(const std::function<bool(const TreeItem *, const TreeItem *)> &cmp);
     void update();
+    void updateAll();
     void updateColumn(int column);
     void expand();
     TreeItem *firstChild() const;