Zebra coloring type differentiation for indented C-type blocks (if, for, repeat)

[Turgut Guneysu]

	SNAP style color change for indented blocks of the same kind. Will make reading IF / ELSE groups easier. I have included an actual IF grouping from a library, removed the actual comparisons and action codes. With the actual codes. it is rather cumbersome and error-prone to figure out which ELSE goes with which IF and where to insert any new code accurately.

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[John Maloney]

I agree, this could be improved.

However, when I was optimizing the redisplay code I found that zebra coloring in MicroBlocks slowed things down significantly. Personally, I'd rather have fast scrolling and UI interactions than zerbra coloring. :-)

Mark has suggested some changes to the graphic design of the blocks (e.g. border colors) that should help with readability.

I also think the drag-and-drop algorithm could be tuned to make it easier to drop a block into one of these structures where you want it go.

[Turgut Guneysu]

Thank you for considering. I'm sure the new way will be an improvement.