spr36279: Fix space-req computation for hlist-panes in windows.
hlist-panes are similar to text-editors in that they have a scroller-pane as a parent, but they provide their own scroll bars. (This is for layout reasons, apparently.) This change updates hlist-panes' compose-space methods to correctly compute the space requirements for their items, so that the vertical scroll bar doesn't overlap longer item names when it doesn't have to.
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