App rapidly switches between floating and docked sidebar if content needs scrollbar with docked sidebar open

[z0w13]

Reproduction:

1. Have a page that only needs to scroll if the sidebar is open and docked
2. Resize the window to the break-point for the sidebar being docked/floating
3. I hope you aren't photosensitive

It's a bit difficult to intentionally cause because it needs a specific amount of elements and layout to cause this specific condition.

Possible solutions:

1. Always show the scrollbar
2. Have some space reserved for where the scrollbar would be if it's not needed (scrollbar-gutter css property?)

[z0w13]

Should be fixed in v0.10.1