Regarding removing points from the underlying envelope when creating automation items -- the thinking was that the points are moved into the automation item container, rather than copied, and the expected use case would be that the user wants to collect a section of an envelope into the container and move it around.
The intended behavior is to add edge points to the underlying envelope where necessary so that the underlying envelope doesn't change just because the automation item was created. So what is shown in post #4 above is a bug, there should be an edge point added to the underlying envelope on the left edge of the new automation item, if automation items are not attached on the left side.
That's why the behavior is how it is, but it doesn't need to be that way. If it is more useful to retain the points underneath new automation items, that's an easy change to make.
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