Make Playlist items span full width
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Authored by ngraham on Jun 4 2019, 5:02 PM.

Description

Make Playlist items span full width

Summary:
Currently playlist items do not span the full width; there is a bunch of
complicated logic to determine the margins and playlist's width. This
makes the display look unbalanced and causes a subtle visual bug
(see BUG: below).

This patch resolves both issues by making playlist items visually stick to
both edges of the playlist, just like the category selector list items do.

This patch also does a bit of necessary code cleanup for the playlist states.
I tested this out quite a bit but to make sure there were no regressions but
it's possible that I missed something so more testing may be needed.

BUG: 408210

Test Plan:
Before: