Is this happening all the time for you? I was just spamming wildly mouse clicks allover the layout and could not reproduce that what you have on images above.
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You can see the starting point from the line, it happens when i click in a straight line through a wall
This is a bit odd I must say. I just tried to repeat the path, just like yours on the images. And don't get that issue. Tested on Chrome, Firefox and new NW_alpha3 and still can't reproduce that.
Well i had a an old version of moveto, now it works fine, thanks!