Debugger: Don't use QApplication::alert too often

There's an ICore::raiseWindow() call already for spontaneous stops,
conditioned on boolSetting(RaiseOnInterrupt). This should be sufficient
for normal operation.

Task-number: QTCREATORBUG-12769
Change-Id: I33daad2579f9cfdb8fd121b9c9db73c05f9eccb7
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/debugger/debuggerengine.cpp

@@ -1513,9 +1513,6 @@ void DebuggerEnginePrivate::updateState()
     const bool detachable = stopped && !isCore;
     m_detachAction.setEnabled(detachable);
 
-    if (stopped)
-        QApplication::alert(ICore::dialogParent(), 3000);
-
     updateReverseActions();
 
     const bool canSnapshot = m_engine->hasCapability(SnapshotCapability);