The following scenario causes rendering failure
where blank tiles are returned in CP-5.3.
1. Load doc where the cursor is saved to a top cell.
2. Page down to grow the document rows.
3. Render tile at last row.
4. Load a new view to the same doc (do nothing else).
5. Render same last-row tile, now it's transparent.
Change-Id: I8f7caf61a7d221d1ccf56762b1e609de987976c5
Reviewed-on: https://gerrit.libreoffice.org/37132
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>
