[Webkit-unassigned] [Bug 265857] Drag and drop is broken on Linux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265857

--- Comment #1 from toterddd at gmail.com ---
I believe I may have found the culprit.

In the DropTargetGtk3 implementation it says:
```c++
// WebCore needs the selection data to decide, so we need to preload the
    // data of targets we support. Once all data requests are done we start
    // notifying the web process about the DND events.
    auto* list = gdk_drag_context_list_targets(m_drop.get());
    static const char* const supportedTargets[] = {
        "text/plain;charset=utf-8",
        "text/html",
        "_NETSCAPE_URL",
        "text/uri-list",
        "application/vnd.webkitgtk.smartpaste",
        "org.webkitgtk.WebKit.custom-pasteboard-data"
    };
```

I have tried modifying Mozillas provided example and added a line like
```js
event.dataTransfer.setData("text/plain", "vier");
```
and the drop worked afterwards.
Full code:
```html
<div class="dropzone">
  <div id="draggable" draggable="true">This div is draggable</div>
</div>
<div class="dropzone" id="droptarget"></div>

```

```css
body {
  /* Prevent the user from selecting text in the example */
  user-select: none;
}

#draggable {
  text-align: center;
  background: white;
}

.dropzone {
  width: 200px;
  height: 20px;
  background: blueviolet;
  margin: 10px;
  padding: 10px;
}

```

```js
let dragged = null;

const source = document.getElementById("draggable");
source.addEventListener("dragstart", (event) => {
  // store a ref. on the dragged elem
  dragged = event.target;

  event.dataTransfer.setData("text/plain", "vier");
});

const target = document.getElementById("droptarget");
target.addEventListener("dragover", (event) => {
  // prevent default to allow drop
  event.preventDefault();
});

target.addEventListener("drop", (event) => {
  // prevent default action (open as a link for some elements)
  event.preventDefault();

  console.log(event.dataTransfer.getData("text/plain"));
  // move dragged element to the selected drop target
  if (event.target.className === "dropzone") {
    dragged.parentNode.removeChild(dragged);
    event.target.appendChild(dragged);
  }
});

```

Disclaimer: I have absolutely no knowledge of WebKit and just looked at the code for the first time so I have no idea if this will cause issues.

I think a default target should be set for those events that do not explicitly set it since the html specification does not mention requiring this property to be set.

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