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This script emits most of the SGR escape sequences supported by
saneterm, so rendering of them can easily be tested. It is not a
perfect test case since it only emits nested sequences in a limited
fashion.
Similar test tools:
* sgr-test.sh from vte:
https://gitlab.gnome.org/GNOME/vte/-/blob/c17e6d12da00a94c3768be6671182a6a039ec0c0/perf/sgr-test.sh
* 256test.sh from vte:
https://gitlab.gnome.org/GNOME/vte/-/blob/c17e6d12da00a94c3768be6671182a6a039ec0c0/perf/256test.sh
* msgcat --color=test from gettext (only uses 16 colors, sequences for
some text styles are broken like italic and underline sometimes)
* lolcat -t [-i] is useful for testing true color support
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