Fix #1725(renderContainer): adjuster had no width when first run

We were getting a flash of misaligned content because the adjuster
runs before the style computation, but the style computation provided
the width that the adjuster was using.

Also added some ngdoc into renderContainer.
Merge pull request #1848 from PaulL1/1725_flash_of_misalignment

Fix #1725(renderContainer): adjuster had no width when first run