Finish excising electric indent from `open-line'
* lisp/simple.el (open-line): Remove INTERACTIVE argument. * test/automated/simple-test.el (open-line-indent, open-line-hook): Adjust accordingly. This change finishes what my commit of Thu Nov 19 17:32:37 2015 -0600 (git commit c5935389) started. It turns out that having INTERACTIVE cause `post-self-insert-hook' to run (via `newline') meant `open-line' still had the electric indent behavior, as `post-self-insert-hook' normally contains `electric-indent-post-self-insert-function' ever since `electric-indent-mode' has been on by default. Tracing the code change in `open-line' is mildly twisty, because Artur Malabarba's earliest two commits of 24 Oct 2015 first removed the `interactive' form entirely (git commit 6939896e) and then restored it with the new extra "p" already added (git commit bd4f04f8), such that there is no single-commit diff in which one sees the second "p" appear. Thus this change is effectively a reversion of parts of each of those commits. This could close bug#21884, at least until further discussion.
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