Mitchell Hashimoto fe32f7b189 terraform: ignore RequiresNew for collection removal in diff.Same ...

Fixes #11349

I tracked this bug back to the early 0.7 days so this has been around a
really long time. I wanted to confirm that this wasn't introduced by any
new graph changes and it appears to predate all of that. I couldn't find
a single 0.7.x release where this worked, and I didn't want to go back
to 0.6.x since it was pre-vendoring.

The test case shows the logic the best, but the basic idea is: for
collections that go to zero elements, the "RequiresNew" sameness check
should be ignored, since the new diff can choose to not have that at all
in the diff.

2017-02-06 17:46:48 -08:00

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