Commit 8e6d642e authored by Sandro Santilli's avatar Sandro Santilli

UnaryUnion: Drop assumption about union not moving vertices

The assumption resulted in invalid geometries being output
by CascadedPolygonUnion intermediary results and then fed
as input by further union calls, which in turn would fail
on first robustness issue.

Fixes #837 in 3.6 branch
Includes automated XML test
parent 459ae2f5
Pipeline #9874591 passed with stage
in 25 minutes and 50 seconds