My custom NSView overrides magnifyWithEvent: and rotateWithEvent: methods to receive trackpad events, and also relies on beginGestureWithEvent: and endGestureWithEvent: for additional logic.
However in OS X 10.11 GM Seed the beginGestureWithEvent: and endGestureWithEvent: methods are no longer called.
If this is a bug of El Capitan, it will ruin many apps' normal operation!
Please advise.