TreeModel: API for setting header tool tips

Change-Id: Ieea98d244d689778db868604d981badcd166a7b5
Reviewed-by: hjk <hjk@theqtcompany.com>

src/libs/utils/treemodel.cpp

@@ -917,6 +917,8 @@ QVariant TreeModel::headerData(int section, Qt::Orientation orientation,
 {
     if (orientation == Qt::Horizontal && role == Qt::DisplayRole && section < m_header.size())
         return m_header.at(section);
+    if (role == Qt::ToolTipRole && section < m_headerToolTip.size())
+        return m_headerToolTip.at(section);
     return QVariant();
 }
 
@@ -976,6 +978,11 @@ void TreeModel::setHeader(const QStringList &displays)
     m_columnCount = displays.size();
 }
 
+void TreeModel::setHeaderToolTip(const QStringList &tips)
+{
+    m_headerToolTip = tips;
+}
+
 QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent) const
 {
     CHECK_INDEX(parent);