debugger: suppress signal popups during auto tests

Task-number: QTCREATORBUG-6951
Change-Id: I35152a6f0422d4cbca356dab8b95033b166115fb
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/gdb/gdbengine.cpp

@@ -1634,7 +1634,7 @@ void GdbEngine::handleStop1(const GdbMi &data)
             } else {
                 showMessage(_("HANDLING SIGNAL " + name));
                 if (debuggerCore()->boolSetting(UseMessageBoxForSignals)
-                        && !isStopperThread)
+                        && !isStopperThread && !isAutoTestRunning())
                     showStoppedBySignalMessageBox(_(meaning), _(name));
                 if (!name.isEmpty() && !meaning.isEmpty())
                     reasontr = msgStoppedBySignal(_(meaning), _(name));