Bug 233137

Summary:

`gestureend` event fired twice for same gesture, occasionally

Product:

WebKit

Reporter:

Dan <dan>

Component:

UI Events

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

hi, simon.fraser, thorton, webkit-bug-importer, wenson_hsieh

Priority:

Keywords:

InRadar

Version:

Safari 15

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Logger that displays wheel, touch, and gesture events	none
Video repro	none

Dan

Reported 2021-11-15 10:42:51 PST

Created attachment 444274 [details] Logger that displays wheel, touch, and gesture events Occasionally when performing a pinch & twist gestures (that produce, in turn, a scale and a rotation in the emitted gesture events), the `gestureend` event is fired twice for the same gesture. This goes against the expectation in regards to the order of gesture events (a series of `gesturechange` events bookended by exactly one `gesturestart` and exactly one `gestureend` event). It can also cause problems where the `gestureend` handler is not idempotent, and in the case of applying transformations, the handler is expected not to be. The bug is elusive, but can hopefully be caught in the attached test file (which I believe is correct, unless I'm missing something obvious). I will also attach the bug repro in video form.

Attachments
Logger that displays wheel, touch, and gesture events (3.72 KB, text/html) 2021-11-15 10:42 PST, Dan	no flags	Details
Video repro (1.51 MB, video/mp4) 2021-11-15 10:45 PST, Dan	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Dan

Comment 1 2021-11-15 10:45:47 PST

Created attachment 444275 [details] Video repro While performing a compound gesture (scale + rotate), the `gestureend` event is emitted twice.

Radar WebKit Bug Importer

Comment 2 2021-11-22 10:43:32 PST

<rdar://problem/85680216>

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