When control-scroll zooming, cursor drifts up and to the left

Number:rdar://49823241 Date Originated:April 11 2019, 3:37 PM
Status:Open Resolved:
Product:macOS + SDK → Accessibility Product Version:macOS 10.14.4 (18E226)
Classification:UI/Usability Reproducible:Always
When using the Accessibility setting to enable zooming with Control-Scroll, the mouse cursor drifts up and to the left during the scroll event.

Steps to Reproduce:
1. Use Command-Option-F5 to bring up Accessibility Options.
2. Make sure "Enable Zoom" is checked.
3. Dismiss Accessibility Options.
4. Hold the Control key and scroll up (two fingers on a trackpad) to zoom in.

Expected Results:
Cursor stays fixed relative to the content behind it.

Actual Results:
Cursor drifts up and to the left as you scroll.

macOS 10.14.4 (18E226) (confirmed with a few different people)

Does not repro in these conditions:
- 10.14.3 (at all - this is a 10.14.4 regression)
- 10.14.4 (when using a "zoom window" instead of a full screen zoom)

Attached videos also linked here: https://cl.ly/43452016fabe


Apple closed this as an internal dupe. It is also fixed in Catalina.

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