Project Tree: Add functionality to expand a single node recursively

From time to time, I find myself wanting to fully expand
a specific sub-tree.

Change-Id: Ie49b76a7a7a6fae3684bbdfb5735638bbc41b301
Reviewed-by: hjk <hjk@qt.io>

src/plugins/projectexplorer/projecttreewidget.cpp

@@ -432,6 +432,20 @@ void ProjectTreeWidget::setAutoSynchronization(bool sync)
         syncFromDocumentManager();
 }
 
+void ProjectTreeWidget::expandNodeRecursively(const QModelIndex &index)
+{
+    const int rc = index.model()->rowCount(index);
+    for (int i = 0; i < rc; ++i)
+        expandNodeRecursively(index.model()->index(i, index.column(), index));
+    if (rc > 0)
+        m_view->expand(index);
+}
+
+void ProjectTreeWidget::expandCurrentNodeRecursively()
+{
+    expandNodeRecursively(m_view->currentIndex());
+}
+
 void ProjectTreeWidget::collapseAll()
 {
     m_view->collapseAll();