Debugger: Make the text of error message box selectable

In some cases, it would be convenient if a text (e.g. a url)
was selectable via mouse in order to be copied.

Change-Id: Ifff27e10a70ee8efcae5073bfbe9225e39fb598f
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggerplugin.cpp

@@ -2641,6 +2641,7 @@ QMessageBox *showMessageBox(int icon, const QString &title,
         title, text, QMessageBox::StandardButtons(buttons),
         ICore::mainWindow());
     mb->setAttribute(Qt::WA_DeleteOnClose);
+    mb->setTextInteractionFlags(Qt::TextSelectableByMouse);
     mb->show();
     return mb;
 }