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…ilable staleTiles and renderTiles only looked for descendants if the ancestor walk came up empty. _retainAncestor stops at the first loaded tile up to five levels above, and neighbouring tiles share ancestors, so one cached tile was enough to drop the descendants across the whole view. Zooming out shows it: the sharp tiles already on screen are discarded for a coarse cached ancestor before the new level loads. They are not alternatives, so keep both until the target level is ready. renderOrder already draws the higher resolution ones on top where they overlap.
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staleTilesandrenderTilesonly looked for descendants if the ancestor walk came up empty._retainAncestorstops at the first loaded tile up to five levels above, and neighbouring tiles share ancestors, so one cached tile was enough to drop the descendants across the whole view. Zooming out shows it: the sharp tiles already on screen are discarded for a coarse cached ancestor before the new level loads.They are not alternatives, so keep both until the target level is ready.
renderOrderalready draws the higher resolution ones on top where they overlap.