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Fix duplicating the "whitespace changes only" banner when expanding lines.
Review Request #8799 - Created March 6, 2017 and submitted
Files that just have whitespace-only changes have a yellow banner saying "This file contains only whitespace changes." This was being unconditionally generated in the template for the first chunk in a file, which meant that if you expanded the lines for the first chunk, you'd get another copy of the banner, and same with collapsing. This change adds a check in the template to prevent this banner from appearing in "standalone" mode (where chunks of a diff are being returned without the rest of the file). It also adds a bottom border to this, so that when the chunk is expanded, it has a nice clean separation from any equals lines.
Tested with a file containing only whitespace changes. Expanding and
collapsing the first chunk didn't result in duplicate banners.