Manuel Jacob <me@manueljacob.de> [Tue, 28 Jul 2020 20:07:05 +0200] rev 45199
context: re-add `overlayworkingctx._compact()` removed in 6a5dcd754842
This partially backs out 6a5dcd754842. The method was and is unused, but a call
to it is introduced in the next patch.
Differential Revision: https://phab.mercurial-scm.org/D8842