Extension icon doesn't revert back when the domain is removed from Whitelist tab

[uBlock-user]

Description

Disabling uBO on a website and enabling it back by removing the domain from Whitelist tab doesn't change the extension icon on Chromium.

A specific URL where the issue occurs

https://www.google.com/

Steps to Reproduce

1. Browse to https://www.google.com/

2. Open the popup panel and click the big blue power button to deactivate uBO on www.google.com, open the dashboard, browse to whitelist, remove the domain entry - www.google.com and Apply changes, close the dashboard tab and switch back to google.com tab.

3. Open the popup panel and notice the big blue power button is back to being blue as expected, but the extension icon still remains grey and not changing to red.

Expected behavior:

Extension icon should revert back to red when uBO is enabled on google.com after being disabled.

Actual behavior:

Extension icon remains grey.

Your environment

• uBlock Origin version: 1.21.3b0
• Browser Name and version: Chromium 77
• Operating System and version: Win 10

As discussed in https://github.com/orgs/uBlockOrigin/teams/ublock-issues-volunteers/discussions/114

[uBlock-user]

It doesn't work if I open dashboard in a new window instead of new tab, I remember you once mentioning about each new window being isolated from the main browser window, so is that to be expected ?