Pinch-to-zoom dragged offscreen causes borked simulator

Number:rdar://37768729 Date Originated:2/21/2018
Status:Open Resolved:
Product:iOS Product Version:9-11
Classification:Serious Bug Reproducible:Always

Use the pinch to zoom gesture in the Maps app on any iOS simulator and drag offscreen.  After this the simulator does not respond properly to touches, as if pinch to zoom gesture has not completed.  This defect is not specific to the Maps app, I found it first in a totally different app. Have not been able to reproduce on an actual device.

Steps to Reproduce:
1. Open Maps app
2. Use pinch-to-zoom gesture to drag map about for a bit
3. Without releasing the gesture, drag the two gray dots as far as you can so the mouse cursor moves off screen

Expected Results:
Touch events would be handled as usual

Actual Results:
Touch system seems totally borked - even after force-quitting the app

OS X 10.13.3
XCode 9.2 (9C40b)


Please note: Reports posted here will not necessarily be seen by Apple. All problems should be submitted at before they are posted here. Please only post information for Radars that you have filed yourself, and please do not include Apple confidential information in your posts. Thank you!