Allow multi-line favorites in horizontal mode

[shinglyu]

Use case: I have many favorites and I prefer to use horizontal mode. I'm happy to give it 2~3 lines of height.

Current behavior: Currently all the favorites are on one line, regardless of the height of the container. If the width overflows the window, there is a scroll bar.

Expected behavior: I'd expect the favorites to wrap around to the next line, give that there are enough vertical space. Similar to the behavior of CSS flex-wrap: wrap