Review scrollbar-stable

[darrenburns]

From @willmcgugan: I have a suspicion that scrollbar-stable doesn't work, or (fairly likely) I don't understand what it does.

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[darrenburns]

I think it does work, or at least it did work as of a couple of months ago. I believe I use it in my file manager.

[willmcgugan]

Yeah, I think I understand it a bit more now. Does seem to do something useful.