[Webkit-unassigned] [Bug 158276] New: Tapping from one <input> to another in an overlay can cause shaking/jiggling effect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158276

            Bug ID: 158276
           Summary: Tapping from one <input> to another in an overlay can
                    cause shaking/jiggling effect
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.3
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com
                CC: simon.fraser at apple.com

Steps to reproduce:
1. Open http://output.jsbin.com/xedane/quiet in Safari on iOS 9.3.2.
2. Tap the "Launch modal" button.
3. Scroll down to "field 7".
4. Tap into the <input> below "field 7".
5. Tap into the <input> above it.

Actual result:
While focusing the <input>, the modal moves up and down multiple times, causing an unsightly jiggling/shaking/jerky effect

Expected result:
When focusing the <input>, the modal should move smoothly, preferably in a single motion.

Original Bootstrap bug report:
https://github.com/twbs/bootstrap/issues/19927

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