Fix for raster resolution #5412
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This PR aims to fix #2516 and fix #5411.
Briefly, it adds a small tolerance to
resolution()to prevent tiny resolutions, and hence enormous values, due to rounding errors. The tolerance's value is the same as inall.equal().In addition, it computes the cell positions before coord transformation to prevent some rounding errors in the first place. This doesn't affect the computation as non-linear coordinates aren't compatible with
geom_raster().