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Vlib: Return all intersection points from Vect_line_get_intersections (…
…#2358) * Vlib: report all line intersections in Vect_line_get_intersections|2() Current implementation of function Vect_line_get_intersections() reports a single intersection even if lines cross multiple times (a buggy implementation introduced by me in 2008 with https://trac.osgeo.org/grass/changeset/34306) Added tests should cover most of line intersection cases. Also fixes bug #2344 (+ a test case) Contains an update to documentation (from PR #2359 by metzm; fixes #2345)
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