Update narrow and hidden sidebar selectors #2184
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Visually, the forced narrow sidebar looks the same as a narrow window (<900 px).
The hidden sidebar does not hide the far left bar, but does hide the conversation list.
[The good news is that the message previews are still there when the window is narrow, but just hidden. So it may be able to be reconstructed, unlike in #1652. I'll leave that as a separate pull request though.]