[Gecko Bug 1706223] Fix whitespace handling in clamp() parsing. #28622
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We should just restore the state when seeing whitespace and an unknown
token like when we do when finding any other token a few lines below.
This is not an issue for most callers (it's only an issue for clamp())
because the other callers use either
parse_comma_separated()
(formin/max), or
parse_nested_block()
(for parens / nested calc()).Both of those functions restrict the input in such a way that
is_exhausted returns true (a few lines above) and thus we parse
successfully.
Differential Revision: https://phabricator.services.mozilla.com/D112681
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1706223
gecko-commit: 8908151379dc2ae9f5594558ede67711e3617010
gecko-reviewers: xidorn