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A frame slot `side-panel`: a plugin's panel right of the mail list and
reader, opened from a button in the panel rail (Mountain View's, or a slim
rail in the default layout while a plugin offers one). `ui.setSidePanel`
names its button; `ui.openPanel('side-panel')` opens it.
`ui.setSidePanel` takes `rail: false`: the rail draws no button for the
plugin's panel, which then opens only on the plugin's request
(openPanel / togglePanel('side-panel')), e.g. from a top bar action. A
rail left without buttons is not drawn, in the default layout and in
Mountain View's side panel alike.