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Using the vte crate allows removal of the ansi parser state machine and
enables us to just be concerned with actions described in the protocol.
In addition to making alacritty simpler, this also improves correctness
and performance.
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The pty read thread now runs the parser and directly updates the
terminal in the same thread. This obviates the need for a channel which
sends every char read from the pty; this is a huge performance boon.
Synchronization between the updater and the renderer is now achieved
with a PriorityMutex. Previously, an atomic bool was (poorly) used to
request the lock on terminal. The PriorityMutex is dead simple to use,
and it _Just Works_.
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The upcoming Utf8Chars iterator was vendored from a libstd PR. The
iterator works on BufRead types which is critical for improving
performance. A small modification was made where the number of unused
bytes is included with Utf8CharsError::IncompleteUtf8.
The pty reader thread was updated to use this new type. Next steps will
be moving the parsing there and either sending parse results in batches
or updating the terminal directly from that thread.
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