ProjectManager: Adding new kit to Quick UI seems to fail to re-evaluate the project

Steps to reproduce:

• have QmlProjectManager plugin enabled
• create a Quick UI from template
  • should create a project with a single valid kit
• switch to Projects view
• add a new kit (which is also valid for the used Quick version) to this project

Current result:

• project seems not to get re-evaluated
• Run/Debug buttons are disabled (Tool tip states sth like 'No qmlviewer or qmlscene found')

Expected result:

• project get's re-evaluated with the new setting and I can run/debug this project

Note: on cmdline I'm getting a warning which might be related:

QObject::connect: signal not found in QmlProjectManager::QmlProject