Limit endpoint extension

[patmo141]

Perhaps a pixel distance, or a filter if the nearest free InputPoint is more than 5x away than the closes regular InputPoint...then don't offer to extend the line to it.

For example this is kind of weird feeling. Most times the proposed extension feels very naturual. Other times it feels restrictive.

[ooMICAHoo]

Another idea, if the cursor is within a certain pixel distance of the closest location on the line then don't draw the extension.