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[processing] Don't round grass7 extent and resolution to integer
fix #14582 See: https://hub.qgis.org/issues/14582 The commit removes the a-flag when the grass region for raster analysis is set. The a-flag causes in some cases unwanted rounding of raster extend / resolution, and should not be set hardcoded in processing. It is usually used in combination with the "res" option. For aligning the pixels of the GRASS region to a specific raster, the align option should be used (and not the a-flag). See: https://grass.osgeo.org/grass70/manuals/g.region.html GRASS 6.4 algs do not use the a-flag either, which explains why this bug appears only for GRASS 7.
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