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The new filter comes with these enhancements:
- Processing is rune-wise rather than byte-wise;
it assumes UTF-8 input and single-cell wide characters,
but this condition should be /usually/ satisfied.
- Unprocessed control characters are escaped, `cat -v` style.
- A lot of escape sequences is at least recognised, if not processed.
- Rudimentary preparation for efficient dynamic updates
of task views, through Javascript.
We make terminal resets and screen clearing commands
flush all output and assume that the terminal has a new origin
for any later positioning commands.
This appears to work well enough with GRUB, at least.
The filter is now exposed through a command line option.
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