The endDrawer can be dragged over the drawer

[blac3777]

While attempting to implement "simultaneous left-and-right drawers" from #12686, I noticed that the endDrawer can be dragged over the drawer (but not vice versa) s.t. two drawers are simultaneously on the screen.

I have trouble realizing a case where the existing behavior would be useful. I suggest that one drawer's opening, should trigger the other to ignore gestures until the former's closing. At the very least, there should be a scaffold property to toggle between existing & suggested behavior, and the suggested behavior should be selected by default.

Here is a simple main.dart file to show the existing behavior.

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