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Inspired by 0e513ff862

Cache width shared by Video player, MediaGallery and Cards at the
ScrollableList level, pass it down through StatusList and Notifications.

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Fixes #909

Thanks @ariasuni.

Improve sorting of default themes in the dropdown

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This fixes crashes in pleroma when writing toots with a content warning,
since pleroma inserts a “nsfw” hashtag that isn't part of the toot's text.

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In #9210 the track color was changed to transparent for no apparent reason. This PR restores the previous color selections implemented in #8653 while keeping the updated property name. Per https://github.com/tootsuite/mastodon/pull/9210#issuecomment-441788776 there is no particular reason for the color change in #9210.

Fixes #892

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