Is there an existing issue for this?

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Use case

1. Add a widget to the screen that has text editing. Position it somewhere so that the left and top edges are in the middle of the screen.
2. Set a breakpoint in PointerEventConverter on case ui.PointerChange.down
3. Without the textbox selected, click inside the text control and note the physicalX
4. Click in the same spot and note that the physicalX is much different.

The engine seems to assume that the flutter view was the source of all events, so when it hits flt-text-editing-host it delivers incorrect pointer event data.

Proposal

Perhaps the web engine should make sure that the event was actually on the canvas host element it thinks it was on, and if not, convert the coordinates when converting the DomEvent to PointerData.