[Webkit-unassigned] [Bug 274408] New: Textarea jumps/disappears when scrollbars appear.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=274408

            Bug ID: 274408
           Summary: Textarea jumps/disappears when scrollbars appear.
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fraser at google.com
                CC: sabouhallawa at apple.com, zimmermann at kde.org

Created attachment 471451

  --> https://bugs.webkit.org/attachment.cgi?id=471451&action=review

Minimal test case

If OSX is configured using "System Settings > Appearance > Show scroll bars: When scrolling", then textareas in an SVG can jump across the screen and/or disappear when enough text is added that a scrollbar is needed.  If the above configuration is set to "Show scroll bars: Always", then the bug disappears.

Attached is a minimal test-case.  19 lines of HTML/SVG, no JavaScript or CSS.  Just type into the textarea.

This bug is unique to Safari.  Firefox and Chrome are unaffected.  Affects Google's Blockly.

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