Event Handling Issues in Blurred iframes

[jelveh]

When an app window is blurred some essential events are not sent to its iframe. For example, if Dev Center is not in focus and a local item is dragged over the Drop Area, the Drop Area is not activated because the drag event is simply not sent to the iframe.

Another example would be that when an iframe is not focused and a mouse is over it scrolling, the scrollbars in the iframe don't react. This is again because the blurred iframe is not receiving any of the native events (probably because of pointer-event: none). The default behavior in many desktop environments is that the blurred app still reacts to many of these events.