[Pointer Events] event.isPrimary doesn't always represent the oldest active touch

[Antoine Quint]

Our current support of pointer events for touch devices doesn't always represent the oldest active touch.

[Radar WebKit Bug Importer]

<rdar://problem/46129270>

[Antoine Quint]

Created attachment 355068 [details]
Patch

[EWS Watchlist]

Attachment 355068 [details] did not pass style-queue:


ERROR: Source/WebCore/dom/PointerEvent.h:87:  The parameter name "isCancelable" adds no information, so it should be removed.  [readability/parameter_name] [5]
Total errors found: 1 in 7 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[Dean Jackson]

Comment on attachment 355068 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=355068&action=review

> LayoutTests/pointerevents/ios/pointer-events-is-primary.html:18
> +function dumpEvent(event)
> +{
> +    console.log(`[${event.pointerId} ${event.type}] x = ${event.clientX}, y = ${event.clientY}, isPrimary = ${event.isPrimary}`);
> +}

This function is never used.

[Antoine Quint]

Committed r238344: <https://trac.webkit.org/changeset/238344>