When I selecting features to merge in QGIS 2.14.3-Essen using "merge selected features", I sometimes get "dirty" results with redundant polygon vertices. Is there an ex-ante or an ex-post way to get rid of them? Using Mac OS 10.11.6 El Capitan
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Those gaps are produced because during the digitizing process the "topological" option is not enabled. Hence borders must be redrawn instead of being used as a reference for the new polygon.
There is a simple and quick approach to solve the problem. Here is a demonstration with a polygon layer with the same issues:
1) First the original shapefile, with Chilean administrative regions.
2) After enabling editing mode and merge two regions gaps appear.
3) In editing mode again you could use the 'Node Tool' in order to select the vertices of those gaps.
4) Finally, press Supr to delete the vertices and consequently the gaps.