I'm have a weird behavior working with data structures... 

I draw a keyboard and I tried to use clicks to change the color key. but I have simultaneously responses at boundaries. So I draw the keys without boundaries and I have in black keys vertical boundaries response of black key scalar and white key scalar. 

I can't find error in the patch.. Can anyone confirm if is that a bug or something wrong with me..? :)

Patch attached

Cheers

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