C++: Small fixes to the token buffer.
- Fixed blocking macro check - Enabled buffer "compression": when tokens are generated and no new macro is being blocked, then prepend the tokens to the previous buffer. This happens a lot when undo-ing look-ahead. - Added documentation Change-Id: I6fa816d94ce4696e473bdbc4f3bf477d77e4dd51 Reviewed-by: Nikolai Kosjar <email@example.com>
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