[FileItemRolesUpdater] Fix calculation of requested indexes
In case the last and/or first page (a page being n=m_maximumVisibleItems items) overlapped the already inserted items, one item for each range would be inserted a second time, e.g. for the first page and last page: `beginExtendedVisibleRange == 0` => `endFirstPage := 0` => `0 <= 0` is inserted again. `count == 100; endExtendedVisibleRange == 99; m_maximumVisibleItems == 20` => `beginLastPage := 99` => `99 < 100` is inserted again.
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b351afb9
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