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Currently on iOS `TextField` horizontal drag gestures will have precedence over parent horizontal drag gestures when competing with each other because the default `touchSlop` value used by `TextField` to calculate whether the threshold for a drag has been met is the same as the one used by parent horizontal drag gestures like `PageView`, and other `Scrollable`s. The default value is `18.0`, and because the `TextField` receives the `PointerEvent` first in this scenario, it always declares victory before any parent horizontal drag gestures has the chance to. Native iOS behavior: The parent horizontal drag gestures will always win unless the drag originated on the cursor (collapsed selection), in that case the TextField cursor drag gestures will win. This change: * Introduces `BaseTapAndDragGestureRecognizer.eagerVictoryOnDrag` which can be used to configure the recognizer to declare victory immediately when it detects a drag, or when disabled it will wait until it is the last recognizer in the arena before declaring victory. The default behavior is that it declares victory immediately when the drag is detected. * Eliminates the iOS cursor drag logic from `TextSelectionGestureDetector`, this logic is now delegated to the selection handle overlay which already had this logic in place. * Enables iOS cursor to always beat other drag gestures by setting the touch slop lower. * Disables `eagerVictoryOnDrag` for iOS to allow for parent drag gestures to win and match native behavior. Fixes #124421, Fixes #130198, Fixes #142624, Fixes #142447, Fixes #127017
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