fix issue #2293 and #2288

[sksum]

nx,ny not defined everytime . #2293

[sksum]

multiple ctrl-v keeps on adding json to previous input
clearing pastebox will fix issue #2288

[meganindya]

Pertaining to the nx, ny problem, I think we can remove the nx, ny declarations totally from the if block, and only use x2, y2. Maybe, rename those two as well. As such, they aren't getting modified, so using extra variables to do the same thing feels redundant.

[sksum]

Pertaining to the nx, ny problem, I think we can remove the nx, ny declarations totally from the if block, and only use x2, y2. Maybe, rename those two as well. As such, they aren't getting modified, so using extra variables to do the same thing feels redundant.

sure

[sksum]

I don't know if this was intentional but some other variables are not being defined as well like dxi dxf .

[meganindya]

Yeah, I was working on ES6 refactoring of turtle.js last night. I had to work with the var let thing a lot. In several places, the variables are declared without even var. This was one of them.

[walterbender]

Cherry-picked these commits.