[CP] With Scribble mode on lines are drawn on every page when using the pencil #120478
Description
issue_link
Commit Hash
flutter/engine#644143
Target
stable
pr_link
Impacted Users
iPad users using Apple Pencil to interact with Flutter apps
Impact Description
Interacting (e.g. scrolling) through the app using the Apple Pencil actually draws on the app as if it is a Scribble target, instead of being used as a neutral input like a finger swipe.
Workaround
No
Risk
low
Test Coverage
no - testing to come in #115296
Fix validated manually.
Validation Steps
See #119590 (comment) for minimal reproduction case and recording of what it's not supposed to look like (little left-behind pencil marks).