Adapt to/from based on usage

[loopRW]

when finishing navigation it would be nice to automatically invert to/from (one problem is what to do if start was current location, get the last non-current?). If navigation is manually stopped it would be nice to put automatically tart from current location

[itohtaka]

>> one problem is what to do if start was current location, get the last non-current?

I think "get the last non-current" is good idea.

Last problem is what to do if there is no non-current, i.e. user always started from current location. Set both to/from with last "to"?

[chengxiong-ruan]

not sure the need for this. it could be nice to have. but not a must. quite a few chance we would use that.