electron: Dropping items onto a webview doesn't trigger the 'drop' event

• Electron version: 1.6.0
• Operating system: OSX

Expected behavior

Expecting event ‘drop’ on the document object to fire

Actual behavior

Electron triggers a file open dialogue

How to reproduce

1. Bind the drop event in the BrowserWindow control, ie;

document.addEventListener('drop',function(event){
      console.log("I'm getting " + event.dataTransfer.files.length); 
});

1. Drop a file into a webview in the browser window. Event listener doesn’t fire. Fires in stable versions of electron. This may be intended but it used to fire the event. Version 1.4.15 fires the event even if dropped into a webview