QML preview button in the editor tool bar gets disabled after launching the preview once

STEPS:

• Open Qt Creator 13 beta2 and open any QML example (say for e.g., samegame)
• Open one of the QML files and click on Preview button from the Editor
• Observe that the button was enabled and on click launches preview
  

• However the preview is not proper. (That is some another issue)
• Now close the preview
• Observe that the preview button is still disabled.
  

• Try to open any other qml. The preview button is still disabled in the Editor

OBSERVED:

• The preview button is enabled initially when the Qt Creator is opened and no preview has been viewed yet.
• The preview button gets disabled after launching the preview once.
• The preview button remains disabled until the Qt Creator is re-launched, or another project is opened in the Qt Creator
• The preview was incorrect when tested with Samegame qml example. Running the project shows proper UI

EXPECTED:

• The preview button should be enabled once the preview is closed
• User should not load another project or re-launch the Qt Creator to enable the preview button again

Attachment:

QML livepreview button disable issue.mp4