I have a layer of line geometries in QGIS (version 2/Dufour) and want them all to be singlepart linestrings. However, some of them are multipart geometries (MultiLineStrings in a GeoJSON export). The MultiLineStrings sometimes have small gaps, but not always. Sometimes the geometry end points are in the same position.
How can I highlight/select the individual geometries so that I can easily find the gaps?
Once I can see where the gaps are I'd like to treat them manually, e.g. close the gap manually and merge the geometries.