Chris Loer b3d3ab0e31 [core] Prevent symbols at the same zoom from sharing a crossTileID. ...

Port of GL JS PR #5994.
Fixes issue #10844, which would allow multiple symbols in a tile to share the same crossTileID as one of their duplicate parent-tile symbols. Once the symbols shared a crossTileID, they would permanently remain "duplicates" of each other, even after increasing zoom level allowed the CrossTileSymbolIndex to distinguish between them.

2018-01-17 12:49:30 -08:00

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