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In the end, I think my conclusion yesterday is way to hurry. This needs to be revisited and checked thoroughly.
1. I think only let user choose items in the same level and parent is very important, it can saves tons of hassle.
2. The selected block should all stop when the most front one hits the boundary.
3. Moving down and left seems more broken than up and right.
Thst’s it, hopes best.
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