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e5a35f458f
Fixes part of #150524. Recently I was studying RenderObject and related code to understand how the rendering library tracks which objects need layout, and in particular just how the concept of "relayout boundary" works. The [RenderObject._relayoutBoundary] property itself had no docs, and there were some other areas that I felt could be clearer; so here's a PR where I add those docs. In addition to docs, this makes some small pure refactors. Mostly those are in order to make clear docs easier to write. One rename is to fix a lone straggler from #4425 / #4483. One key thing I learned, which this documents, is an invariant that this code maintains on [_relayoutBoundary]. With that invariant in mind, I found it's possible to simplify that bookkeeping, and to get a measurable performance improvement as a bonus. To keep things simple, though, I'll leave those for follow-up PRs. For ease of review, the PR is broken into several commits each with their own commit message.
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