Disabled tabs can still be selected by clicking (regression from UIT-2487)

A disabled Tab in a UI Toolkit TabView still responds to clicks and becomes the active tab. In Unity 6.0 you could disable a tab to stop it being selected. That behavior was removed by [Internal link] (landed 13 Aug 2025), which added InvokePolicy.IncludeDisabled to the tab header's PointerDownEvent so read-only tab views keep working. Read-only views are used in the Inspector when you edit an immutable object, where clicking a disabled tab must still switch to it.

 

Steps to reproduce:

1. Create a TabView with two or more Tab elements.
2. Disable one tab: myTab.SetEnabled(false).
3. At runtime, click the disabled tab's header.

Actual results:   the disabled tab is selected and shows its content.

Expected results:  the disabled tab cannot be selected; the current tab stays active.

Reproducible with versions: Unity 6.0 works as expected. Broke in a later 6000.x stream 

Not reproducible with versions: 

Can’t test with versions: 

Tested on (OS): Windows

Root cause:

• Modules/UIElements/Core/Controls/Tab.cs:330 registers OnTabClicked with CallbackOptions.IncludeDisabled, so a disabled header still fires selected.
• Modules/UIElements/Core/Controls/TabView.cs sets acceptClicksIfDisabled = true on the next/previous paging buttons.