[Webkit-unassigned] [Bug 178058] dataTransfer.effectAllowed returns "all" when it's set to "copy" or "move" during dragstart

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178058

--- Comment #2 from Wenson Hsieh <wenson_hsieh at apple.com> ---
Small test case showing the problem:

<div id="source" draggable="true">Drag me!</div>
<script>
function write(text) {
    let element = document.createElement("pre");
    element.textContent = text;
    document.body.appendChild(element);
}

function writeEffectAllowed(event) {
    write(`(${event.type}): effectAllowed = ${event.dataTransfer.effectAllowed}`);
    event.preventDefault();
}

source.addEventListener("dragstart", event => {
    event.dataTransfer.effectAllowed = "move";
    write("Setting the effect allowed to move!");
});
document.body.addEventListener("dragover", writeEffectAllowed);
document.body.addEventListener("drop", writeEffectAllowed);
</script>

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