ST_ChangeEdgeGeom doesn't let you change geometry of a closed edge

[strk]

Closed edges can't be changed by current ST_ChangeEdgeGeom as it'll find them always cross a node (the self-node). This is due to the DE-IM9 considering closed edges as having no boundary.

[strk]

This is harder than it looks as if direction of a closed edge is reversed then all linking informations should be updated: left_face/right_face of the edge itself and next_left_edge, next_right_edge of self _and_ adiacent edges !

[strk]

It is even worst than I thought in that updating face linking and edge linking may also be needed for non-closed edges, when the new edge ends up in a different face. Funny enough, the SQL/MM specification do not consider that case at all !

[strk]

Here's an example of changing edge 32 w/out updating left/right face

[strk]

r9063 adds the possibility to change a closed edge.

Checking for correct linking (ring and faces) isn't implemented yet.

[strk]

I've filed #1571 for the topology breaking issue. This specific issue (changing geom of closed edge) is fixed.