Comment 2 for bug 978378

Hi Ikbel,

On a touchscreen, if you put on finger over the target window and two other fingers over other windows, then the intention is ambiguous. Currently, the code looks at the centroid of the touches to determine which window to interact with. By requiring all the touches to hit the same window, we remove all ambiguity about which window is really targeted.

This is really a design decision. To me it makes sense. If you disagree, we can escalate this to the Unity designers and confirm which is correct according to their designs.

Thanks!