Audio Player Doesn't Flow With Float Images

[miqrogroove]

To reproduce this:

1. Start a new post.
2. Insert an image, align left or align right.
3. Insert an audio player.
4. Preview

Expected behavior: Audio player should flow with or clear floated elements.

Actual behavior: Audio player overlaps the image :(

Workaround: Position the audio player before the image, or manually clear floated elements before the player.

Tested 3.8 and trunk.

[DrewAPicture]

Confirmed.

If we just want to clear it, even just adding clear:both to the outer mediaelement container css would probably suffice.

[wonderboymusic]

In 28361:

MediaElement players need clear: both to play nice with adjacent floated elements.

Fixes #27385.