f64bfba860
Fixes https://github.com/flutter/flutter/issues/8476 More detailed list of changes in this patch: * Replaced the didTouch special logic with more generic logic that uses Activities instead. Now instead when you tap down the Scrollable calls `hold()` which begins a HoldScrollActivity which is a hybrid of DragStartDetails and IdleScrollActivity and can be canceled. When you let go, it gets canceled and that goes ballistic. * Make DragGestureRecognizer more aggressive about grabbing pointers, otherwise a second pointer in a situation with competing horizontal and vertical recognizers always gets taken by the other one. * Fixed the _GestureSemantics widget to call the "down" callbacks so that it follows the same pattern as "real" interactions. * Added tests for the above. * Added a hashCode to ScrollActivity.toString (and subclasses). * Added a toString to ScrollDragController, and include it in DragScrollActivity's toString. * s/coorindator/coordinator/ * Add a comment in DragStartDetails to distinguish it from the otherwise identical DragDownDetails, so we're not tempted to merge them.
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