Fill the unit test gaps in common and frontend component code:
- One test per component error code: break a file in one way, check
the codes validation reports, repair it as the backend does (until
valid, at most ten passes) and check what the repair changed.
Pinned: F46 (a dangling ref in a copy child is never reported), F47
and F48 (two repairs that never converge). :component-not-main,
:should-be-component-root and :not-component-not-allowed have no
test, as no file can produce them.
- Library color and typography sync must not touch copies. Both do
(F3): the color sync touches :fill-group, the typography sync
:content-group and :text-content-attribute, and a later main edit of
that attribute then no longer reaches the copy. Pinned.
- Twenty live thf/dump-file calls in common tests go; they printed
whole file trees on every run and asserted nothing.
- The disabled copy-nested-3 frontend test runs again: a stray
backquote quoted its run-store call, so it never called done.
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