inbox [nfc]: Cut superfluous StickyHeaderItems on individual conversations #510
+54
−81
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These were never getting consulted, because these aren't entire items of the enclosing list view; rather the items are the whole sections, i.e. either a whole stream or all DMs. Because they weren't doing anything, they're confusing for understanding how this code works and making changes to it.
I think this happened because in an early draft of #381, the list-view items were individual conversations. That's the arrangement that would be better for performance/smoothness reasons anyway, but it won't work until we make some changes to the sticky_header library; see #389. When we go to do #389, we can always add these StickyHeaderItem widgets back.