
Fixing UI data pipe line, re-rendering: - store section DOM Elements in gr-diff-builder - find diff section by line range - store collapsed lines as gr-diff-group - update gr-diff-builder's data model on expanding collapsed lines - .right/.left CSS classes applied to td.lineNum instead of .content Feature: Issue 3910 Change-Id: Ia0cb78aa00cfd910d186a37631fe71a89204a843