Right click menu appears even when content handles the event

[joewalker]

STR:
Gsuite document / spreadsheet. Right click.

Expected: Single content based menu
Actual: Both the content based menu and a browser context menu.

[jsantell]

The event received from the contextmenu event is identical in google docs as it is with 'correct' contextmenu behaviour.

Creating a test page with document.addEventListener('contextmenu', e => { ... }), preventing the default or stopping propagation doesn't affect whether or not the webview receives the event.