[Webkit-unassigned] [Bug 179927] New: Text cursor blinks outside of input box after scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179927

            Bug ID: 179927
           Summary: Text cursor blinks outside of input box after
                    scrolling
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: danyao at chromium.org
                CC: ajuma at chromium.org, bfulgham at webkit.org,
                    simon.fraser at apple.com, zalan at apple.com

Created attachment 327427

  --> https://bugs.webkit.org/attachment.cgi?id=327427&action=review

Screenshot showing cursor blinking outside of input box

This bug was originally reported by folks from http://n26.com. See http://crbug.com/781297 for original repro steps.

I created a minimal example that reproduces the problem: http://output.jsbin.com/cabejez

Steps to reproduce:
1. On an iOS device, visit http://output.jsbin.com/cabejez in Safari
2. Tab on input box
3. Scroll the page up

Expected result:
Cursor blinks inside the input box

Actual result:
Cursor blinks below and outside the input box. See screenshot attached.

The key ingredient for exposing the bug seems to be the <div> that contains the input box having position:fixed. Normally this <div> is not scrollable. But when the <input> is focused, it seems that the view is scrolled in UIProcess, but the WebProcess didn't get the update.

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