Emilio Cobos Álvarez 8814b4ab14 Bug 1706223 - Fix whitespace handling in clamp() parsing. r=xidorn
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()` (for
min/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
2021-04-21 13:39:13 +00:00
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