As a follow-up to bug 49428 and bug 50771, default whitespace for headings should includespaces before/after ==.
Or in other words: prefer "== Heading ==" to "==Heading==".
(While this might seem minor, the first style was enforced at pl.wp with automated tools since ever and editors gets annoyed when VE changes it. Reported at https://pl.wikipedia.org/wiki/Wikipedia:VisualEditor/Opinie#sprz.C4.85tanie_kodu )
Version: unspecified
Severity: enhancement