allow shorting an edge via the "edge operations" context menu

[angelobanse]

An option like "end edge here" (for edges with no successor) would be nice. It would allow to keep all existing id's, and avoid creating a new junction.

• The current workflow ("edge operations" -> "Split edge here") introduces a new junction
• Moving the final junction to the desired new position messes up the angle on large edges and doesn't delete geometry points

[namdre]

actually, I would do this as

1. split
2. delete original to-junction

[behrisch]

an option in the move mode which automatically removes geometry points when you move the destination junction along the edge would be even better