debugger: rework the searchable view

This reverts most of commit 32ec60958d
and keeps the tree widgets fully accessible.

Change-Id: I34422c175bc43261bb8fe48e0130acb71cdfd721
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/sourcefileswindow.h

@@ -38,18 +38,24 @@
 namespace Debugger {
 namespace Internal {
 
-class SourceFilesWindow : public BaseWindow
+class SourceFilesTreeView : public BaseTreeView
 {
     Q_OBJECT
 
 public:
-    SourceFilesWindow(QWidget *parent = 0);
+    SourceFilesTreeView(QWidget *parent = 0);
 
 private:
     void rowActivated(const QModelIndex &index);
     void contextMenuEvent(QContextMenuEvent *ev);
 };
 
+class SourceFilesWindow : public BaseWindow
+{
+public:
+    SourceFilesWindow();
+};
+
 } // namespace Internal
 } // namespace Debugger