Is it possible to trigger the copy/paste context menu from the System app by passing touch events to HTMLIFrameElement.sendTouchEvent <https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/sendTouchEvent> ?
Sending 'touchstart' and/or 'mousedown' events does not trigger the menu; it seems `sendTouchEvent` doesn't produce any meaningful selection events otherwise. (Our marionette tests are able to produce this context menu, but I presume that's through a different codepath.) I'm admittedly unfamiliar with how input events flow through Gecko to produce this menu, and my dxr-fu isn't great. Additional context: I'd like to intercept touch events (which works) and pass them onto the appropriate element/iframe (which works, in general), but I haven't been able to figure out how to forward the long-press gesture that triggers the copy/paste menu. This is relevant for the incoming native utility tray enhancements <https://bugzilla.mozilla.org/show_bug.cgi?id=1178162>. Any pointers or tips would be appreciated. Based on what I've seen so far, it appears that this isn't possible as-is. Marcus
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