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With transparency, "glide" leaves overlap dots along line segment #183

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@jwzimmer-zz

Description

@jwzimmer-zz

Expected Behavior

I think the motion blocks "glide" and "go to" should draw the same line on the stage, but glide should take place over a specified time period.

However, in 2.0 this does not seem to be the case either, so maybe this is expected behaviour? (Thus the needs-discussion label.)

Actual Behavior

(In 3.0) Lines drawn with glide look different than lines drawn with go to. Glide must divide the total length into smaller segments in order to apportion how much distance to travel in an allotted time, and when transparency is enabled (the line isn't fully opaque), then where the pen/ sprite has started and stopped in order to draw the smaller segments, the endpoints overlap and are colored in twice (so appear as darker dots). It's kind of a cool effect, but I don't know that it's how we intend glide to work with transparency?

3.0 transparency + glide
screen shot 2017-10-25 at 10 23 18 am

@chrisgarrity pointed out that there are dots in 2.0 as well, but they don't seem to be the same dots:

It kind of looks like 2.0 glide does pen down/up at each point and there are more points.

2.0 transparency + glide
screen shot 2017-10-25 at 10 22 35 am

Steps to Reproduce

screen shot 2017-10-25 at 10 04 19 am

screen shot 2017-10-25 at 9 59 19 am

Operating System and Browser

Mac OS El Capitan, Chrome Version 61.0.3163.100, at https://ericrosenbaum.github.io/scratch-gui/extensions-oct2017/

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