"__dockview_internal_drag_event__" is pasted if drop on an editable widget

[hackwaly]

Drag a tab to chrome's location bar, it will replace the location to "dockview_internal_drag_event"

[techbech]

I wanted to make it possible to drag a tab onto another application, so I requested the possibility to access the data transfer object

#299

It was implemented here

https://github.com/mathuo/dockview/pull/322/files#diff-a22c4f0fca5755287b9458a40efb6520028ddad7a4224ab7f83ae524900551afR86-R114

        const panelDragDisposable = api.onWillDragPanel((event) => {
            const dataTransfer = event.nativeEvent.dataTransfer;

            if (dataTransfer) {
                dataTransfer.setData(
                    'text/plain',
                    'Some custom panel data transfer data'
                );
                dataTransfer.setData(
                    'text/json',
                    '{text: "Some custom panel data transfer data"}'
                );
            }
        });

This way, you can make the value, when dropped in a text field, whatever you like.