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Revert "Revert "RFC T157418: Trim whitespace in wikitext headings, lists…

Description

Revert "Revert "RFC T157418: Trim whitespace in wikitext headings, lists, tables""

This reverts commit 945ed237bad254dcc7e7571c0937bf7889475e19.

This patch should be merged with other followup patches that fix
roundtrip diff classification.

Change-Id: Iad730db532cfe99a9dfeabf6a84362401d547ab2