Issue #440 - libgimp/gimptilebackendplugin.c provides no pyramid
In GimpTileBackendPlugin, return NULL when fetching z>0 tiles, instead of simply ignoring the z coordinate, so that the mipmapped tile is rendered locally. Likewise, avoid storing z>0 tiles. Note that this is suboptimal, since all the necessary level-0 tiles need to be sent to the buffer as a result. Ideally, we should extend the wire protocol to handle mipmapped tiles.
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