CMake Project: Make sure the tree has focus after adding an item

Adding items and losing them in the tree was a bad usability feature.
On Windows that was the behavior.

Change-Id: Ic0f9b41fce79844aaf8803713cb0220c4618c127
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildsettingswidget.cpp

@@ -319,6 +319,7 @@ CMakeBuildSettingsWidget::CMakeBuildSettingsWidget(CMakeBuildConfiguration *bc)
         });
         QModelIndex idx = m_configModel->indexForItem(item);
         idx = m_configTextFilterModel->mapFromSource(m_configFilterModel->mapFromSource(idx));
+        m_configView->setFocus();
         m_configView->scrollTo(idx);
         m_configView->setCurrentIndex(idx);
         m_configView->edit(idx);