tests: demonstrate bug in `hg fix` with incorrectly dirty working copy If the parent commit needs formatting but the working copy already has the correct formatting, then the working copy will be reported as modified even though it's clean (because the size in the dirstate is incorrect). Because the bug only occurs when the size changes, I modified the formatter used in the test case to remove repeated spaces. Differential Revision: https://phab.mercurial-scm.org/D11208