[Webkit-unassigned] [Bug 174165] New: Incorrect ClipboardEvent.clipboardData when performing Paste and Match Style

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174165

            Bug ID: 174165
           Summary: Incorrect ClipboardEvent.clipboardData when performing
                    Paste and Match Style
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: javan at javan.us
                CC: wenson_hsieh at apple.com

Created attachment 314620

  --> https://bugs.webkit.org/attachment.cgi?id=314620&action=review

Paste event clipboard data inspector

The ClipboardData for paste events are identical when performing Paste (⌘V) and Paste and Match Style (⌥⇧⌘V). Because they're indistinguishable, it's impossible to programmatically handle pastes correctly in a rich text editor (like https://github.com/basecamp/trix, which I help maintain). There's no way to infer the desired format and pick an appropriate type.

To reproduce, open the attached paste-inspector.html file in Safari and paste as instructed. Note that the logged paste events are identical and both contain "text/html" and "text/plain" types. Chrome and Firefox only return a "text/plain" type when performing Paste and Match Style, which I assume is correct.

This issue is also present in previous versions of Safari.

Screenshots
Safari: https://cl.ly/291S1I3L2B25
Chrome: https://cl.ly/3m3B1P0D0Q2E
Firefox: https://cl.ly/3M3v2R2r2T2H

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