Sam Atkins
2ed0f880ee
LibWeb: Add TokenStream::rewind_to_position()
...
Parsing media queries sometimes requires significant back-tracking, so
`reconsume_current_input_token()` was not good enough.
`rewind_to_position()` lets you reconsume an erbitrary number of tokens
to return to an earlier point in the stream, which you previously saved
from `TokenStream::position()`.
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