• Go to the tools demo
• Click "auto-disabling list"
• Click "click to disable this tool"
• "auto-disabling list" now appears greyed out
• Click "auto-disabling list"
• An active effect appears, even though the dropdown is disabled and you can't interact with it at all

Other disabled toolgroups don't have this problem, it's only the one that gets disabled dynamically.

This causes a bug in VisualEditor as well: click out of the editor (this disables most tools and auto-disables the Insert toolgroup), then click Insert. An active effect appears.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=64601