[Tabs] MdTabs, MdExpansionPanel - overflow hidden for content crops radio/icon button ripples

[dmitrysteblyuk]

Bug, feature request, or proposal:

Proposal

What is the expected behavior?

Overflow hidden is applied to content when it's hidden or getting hidden/shown (during animation) only.

What is the current behavior?

Overflow hidden applied to content when it's shown as well.

What is the use-case or motivation for changing an existing behavior?

Things like radio/icon button ripples get cropped inside tab/expansion-panel content.

[mmalerba]

Looks like this has been resolved by #7617

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