[Webkit-unassigned] [Bug 270516] New: Identifiers for touch points are not constant in multi touch

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270516

            Bug ID: 270516
           Summary: Identifiers for touch points are not constant in multi
                    touch
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WPE WebKit
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gebausim at pm.me
                CC: bugs-noreply at webkitgtk.org

Created attachment 470180

  --> https://bugs.webkit.org/attachment.cgi?id=470180&action=review

Showcase

Propably the best way to showcase this is via https://people.igalia.com/clopez/wkbug/pointer-events/paint.html page (as shown in the attached screenshot). Reproduced by simultaneously doing the snake move with one finger on the right and multiple lines with the other hand. What is expected is the first touch not to be influenced by the other ones and remain the same color/id (red) all the way.

Same issue can also be observed in https://patrickhlauke.github.io/touch/tracker/multi-touch-tracker-index.html page. Where the identifier numbers rapidly change between all the currently active touch ids.

Happens since: https://github.com/WebKit/WebKit/commit/84e4a4ae1e8936da66c30862be411246417d44fd

The effects of this are that any javascript pan or zoom gestures don't work properly, can be tested on https://elmarquis.github.io/Leaflet.GestureHandling/examples/. Zooming on the map is just very funky.

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