[Affected versions]: - Nightly 56.0a1 - Latest Nightly 57.0a1 - Beta 56.0b7 [Affected platforms]: - Ubuntu 16.04 x 64 - Windows 7 x 32 - Mac OS x 10.11 [Steps to reproduce]: 1. Go to http://labs.jensimmons.com/2016/examples/grid-content-1.html 2. Open Inspector Grid (Ctrl+Shift+C or Cmd+Alt+C) 3. From Inspector - Layout select 'ul' Overlay Grid and its node. 4. Select 'main' Overlay Grid and that should activate the main grid. 5. Go to Rules and observe grid icon (▦) 6. Repeat step 3, 4 and 5. [Expected result]: - 'ul' grid icon (▦) should be deactivated, indicated by the color black. [Actual result]: - 'ul' grid icon (▦) is blue, which means it's activated. [Regression range]: - This is not a regression because it's reproducing even on Nighlty from 2017-06-20 when the feature was first implemented.

Good catch. Thank you Bogdan. I reproduced this bug.