[Webkit-unassigned] [Bug 260717] New: REGRESSION(2.42): [GTK] Particular lines in text input fields are rendered incorrectly;

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260717

            Bug ID: 260717
           Summary: REGRESSION(2.42): [GTK] Particular lines in text input
                    fields are rendered incorrectly;
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at redhat.com
                CC: bugs-noreply at webkitgtk.org

We have a strange rendering bug that causes lines in text input fields to render incorrectly. The input field sometimes displays outdated contents. For example, I've attached a video that displays a misrendered input field when the contents of one line appear to be duplicated on another line:

Failed to Update
Failed to Update

I click on the broken top line and then press space, and magically the broken line is rendered correctly:

``` 
Failed to Update

i.e. the text on the first line changes from "Failed to Update" to the real text that was actually there, "```", followed by the space that I entered.

I don't know how to reproduce this, unfortunately, so bisecting is not possible.  If we could find a reproducer then we would have a much greater chance of fixing the bug, but I have failed at that. I see this happen quite regularly since at least 2.41.6 but possibly earlier, so the bug was introduced some while back. May or may not be related to dmabuf renderer; I'm not sure.

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