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!

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https://bugs.launchpad.net/bugs/978378

Title:
  A window can be moved even when some fingers are not over it

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