Nyall Dawson 327a069e1c Handle VTPK tile data with zero sizes by falling back to lower
zoom levels for the tile's data

It seems that every VTPK behaves a bit like an indexed VTPK
where higher zoom level tiles may be replaced with lower
zoom level tiles. This new special handling is required
for non-indexed VTPKs where the high zoom level tile data
is empty, but there's not explicit tilemap present to
advise of us this situation in advance.

Fixes #52872
2023-05-22 12:50:51 +10:00
..
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