Adam Barth 9bc64540c5 Improve hit testing
Now a RenderBox is considered hit if one of its children are hit or it itself
decides that it's hit. In particular, empty space inside a flex won't be hit
because none of the children are located there and a RenderFlex doesn't
consider itself hittable.

Fixes #53
Fixes #1221
2015-11-04 16:51:19 -08:00
2015-11-04 16:51:19 -08:00
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