[Webkit-unassigned] [Bug 216368] New: REGRESSION (r255383): Transition from email to password field on login.live.com stutters after going back and forth

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216368

            Bug ID: 216368
           Summary: REGRESSION (r255383): Transition from email to
                    password field on login.live.com stutters after going
                    back and forth
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org

When accessing login.live.com and inputting an email, there is a transition to present the next screen for inputting a password. If the user clicks the back arrow to return to the email input, the animation of that transition stutters. This will occur every time the use transitions forwards or backwards in this login flow.

Steps to Reproduce:
1. Launch Safari
2. Access login.live.com
3. Input an email
4. Click “Next”, verifying the smooth transition
5. Click the back arrow next to the email address 

Expected Results: Transition back to the user name field should be smooth

Actual Results: Transition back to the user name field is jittery, causing the text to stutter

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