debugger: make tooltips non-editable

Task-number: QTCREATORBUG-7028
Change-Id: I8b70435df8b958961204f8498f63b0752a6ad0bf
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggertooltipmanager.cpp

@@ -905,6 +905,7 @@ DebuggerToolTipTreeView::DebuggerToolTipTreeView(QWidget *parent) :
     QTreeView(parent)
 {
     setHeaderHidden(true);
+    setEditTriggers(NoEditTriggers);
 
     setUniformRowHeights(true);
     setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);