QmlDesigner: Add puppet stop message box

You must set DEBUG_QML_PUPPET as environment variable.

Change-Id: I072ac22d2f835781e93401e4a3b876fce6e4b2e0
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/designercore/instances/puppetcreator.cpp

@@ -34,6 +34,7 @@
 #include <QCoreApplication>
 #include <QCryptographicHash>
 #include <QDateTime>
+#include <QMessageBox>
 
 #include <projectexplorer/kit.h>
 #include <projectexplorer/toolchain.h>
@@ -42,6 +43,7 @@
 #include <qtsupport/baseqtversion.h>
 #include <qtsupport/qtkitinformation.h>
 #include <qtsupport/qtsupportconstants.h>
+#include <coreplugin/icore.h>
 
 #include "puppetbuildprogressdialog.h"
 
@@ -130,6 +132,11 @@ QProcess *PuppetCreator::puppetProcess(const QString &puppetPath,
     }
     puppetProcess->start(puppetPath, QStringList() << socketToken << puppetMode << "-graphicssystem raster");
 
+    if (!qgetenv("DEBUG_QML_PUPPET").isEmpty())
+        QMessageBox::information(Core::ICore::dialogParent(),
+                                 QStringLiteral("Puppet is starting ..."),
+                                 QStringLiteral("You can now attach your debugger to the puppet."));
+
     return puppetProcess;
 }