If the room pane is below the default width (by user resizing or because
of narrow window), go to the room settings or a member profile will
automatically expand it as needed.
The pane goes back to its previous size once the settings/profile is
left.
If the window is narrow enough that expanding the pane normally would
reduce the timeline's width past its minimum, the pane is shown as an
overlay instead.
Allow opening context menu for AccountDelegate, RoomDelegate and
MemberDelegate by selecting an item with up/down (when focusing filter
field) and pressing the menu key.
