Navigation Tree View: Fix width of column

We want to have the width both to be at least the contents size
but also stretch to width of the viewport.

Reviewed-By: con

src/plugins/projectexplorer/projecttreewidget.cpp

@@ -116,7 +116,6 @@ ProjectTreeWidget::ProjectTreeWidget(QWidget *parent)
             this, SLOT(filesAboutToBeRemoved(FolderNode *, const QList<FileNode*> &)));
 
     m_view = new ProjectTreeView;
-    m_view->header()->setStretchLastSection(true);
     m_view->setModel(m_model);
     setFocusProxy(m_view);
     initView();