[Webkit-unassigned] [Bug 177715] New: clipboardData.setData() fails on iOS with certain kind of selections.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=177715

            Bug ID: 177715
           Summary: clipboardData.setData() fails on iOS with certain kind
                    of selections.
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lgarron at chromium.org
                CC: wenson_hsieh at apple.com

As documented in https://bugs.webkit.org/show_bug.cgi?id=156529 , Safari doesn't allow document.execCommand("copy") when there is no selection.
It is possible work around this but by creating a temporary selection: https://bugs.webkit.org/show_bug.cgi?id=156529#c4

However, this workaround is broken on iOS. After the temporary selection is selected, document.queryCommandEnabled("copy") returns true and a function registered using document.addEventListener("copy", ...) fires. *However*, `event.clipboardData.setData()` has no effect.

Consider the following sample:

    <script>
    document.addEventListener("copy", function(e) {
      e.clipboardData.setData("text/plain", "This is plain text.");
      console.log(e.clipboardData.getData("text/plain"));
      e.preventDefault();
    });

    function copy() {
      var sel = document.getSelection();
      var range = document.createRange();
      range.selectNodeContents(document.body);
      sel.removeAllRanges();
      sel.addRange(range);
      document.execCommand("copy");
      window.getSelection().removeAllRanges();
    }
    </script>
    <button onclick='copy()'>Copy text (plain)</button>

The `console.log(...)` line prints "This is plain text." on desktop Safari, but a blank string on iOS.
Consequently, the clipboard is emptied (even if it contained something before).

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