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    Are you interested in holes (rings inside polgyons) or reducing gaps between separate polygons? Commented Sep 26, 2015 at 9:03
  • Does this have to be QGIS-based solution? I have blogged previously about how to accomplish this using spatial SQL in PostGIS (geospatial.commons.gc.cuny.edu/2013/11/04/…). If you are not running PostGIS, I could probably adapt this for you to SpatiaLite, which, at guess, if you are using QGIS, you may already have SpatiaLite in your toolchain. Commented Sep 28, 2015 at 17:53
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    Please, do not forget about "What should I do when someone answers my question?" Commented Nov 8, 2022 at 7:29
  • See also the answers here: gis.stackexchange.com/a/402079/88814 Commented Dec 12, 2023 at 8:54