Set default size of VAudioTrack with a computed property

[krysal]

Fixes

Fixes #721 by @obulat

Description

This PR makes the default size for the boxed layout null instead of 'm' (preserved for all other layouts if not explicitly specified) with a computed property, this way we avoid the warning for an invalid prop and it still looks good in the All search results grid, as no fixed width is applied.

Testing Instructions

Follow instructions on the related issue and observe no more warnings are shown, maintaining the normal aspect of the all search results grid.

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[obulat]

Thank you for fixing this, it wasn't a trivial change.
It might be a good idea to add/edit comments, because the VBoxLayout has a comment at the top saying <!-- Should be wrapped by a fixed width parent -->, which probably isn't true anymore?

[zackkrida]

<!-- Should be wrapped by a fixed width parent -->

Yes @obulat maybe something like "The width is determined by the parent element" or something would be clearer.

[krysal]

Thanks for noticing it, comment updated 📝

[zackkrida]

LGTM! I just committed a small typo fix in the new comment 👍