hgridshift/vgridshift: defer grid opening when grid has already been opened #2129
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…opened Relates to OSGeo#2115 With the fix of OSGeo#2128, transforming between EPSG:4326+3855 and EPSG:4269+5703 leads to many operations with many grids, and opening a file handle for each operation saturates the limit of 1024 file handles opened simunalteously. This fix defers grid opening when a transformation has already been instanciated with the same grid.
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Relates to #2115
With the fix of #2128, transforming between
EPSG:4326+3855 and EPSG:4269+5703 leads to many operations with many grids,
and opening a file handle for each operation saturates the limit of 1024
file handles opened simunalteously. This fix defers grid opening when a
transformation has already been instanciated with the same grid.