[Webkit-unassigned] [Bug 151065] New: [Mac] Gesture Events should not have negative scale

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151065

            Bug ID: 151065
           Summary: [Mac] Gesture Events should not have negative scale
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: thorton at apple.com, webkit-bug-importer at group.apple.com

Created attachment 265120
  --> https://bugs.webkit.org/attachment.cgi?id=265120&action=review
[TEST] Gesture Test

* SUMMARY
[Mac] Gesture Events should not have negative scale.

* STEPS TO REPRODUCE
1. Load test page
2. Pinch on the box
  => scale goes negative the box starts re-growing (due to CSS transform scale()). Did not expect the scale to ever go negative.

* NOTES
- Loading the same test case on iOS, the scale does not go negative. It approaches zero but rarely goes below 0.15. It never goes negative.
- Since scale is local to 1 (>1 = fingers moved apart, <1 = fingers moved closer together) it is natural to use a a multiplier of the start value. When values get very close to zero, or go negative, the usefulness diminish and it means a rapid change from the original value.

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