ItemViewSource has some serious problems

[crantila]

Per the boss, it should show: "full city/library name & shelf number, date, provenance, summary". I'll probably have to abbreviate the summary.

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We need to be able to see all of all the fields, but many of the fields are very long. This means two things: in View-based search results, expanding the ItemViewSource makes things much worse; and in the ItemViewOverlay, the large blocks of unformatted text are still hard to read.