[lab][TabPanel] Add keepMounted prop to match joy-ui #41651
Merged
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This PR adds a
keepMounted
prop to the labs implementations ofTabPanel
, bringing it into alignment with the implementation in joy-ui. It also adds a-hidden
class, aligning it with both base-ui and joy-ui for easier styling/theming now that the children can be present in the DOM when the tabpanel is not active.Fixes #37398
Fixes #38178
I am only addressing the immediate absence of this prop compared to joy-ui, and not trying to solve for the broader issue described in #21250.