This moves the original test suite for `filterANSIEscapes` into the same
file as the newer tests. There is some overlap between the old and new
tests but that doesn't hurt anything so I kept them as-is.
Change-Id: Id00000009919024a5f206ec9a7bc0022541ff612
This teaches `filterANSIEscapes()` how to find the end of an OSC
sequence. It also keeps OSC 8 (hyperlinks) when not instructed to filter
out all escapes, just as it keeps colors.
This also relaxes the parsing of CSI escapes to find the end of the
sequence for invalid sequences, and handles better escapes that don't
start CSI or OSC.
This fixes the repl output for `:doc builtins.fetchGit`.
Fixes: https://git.lix.systems/lix-project/lix/issues/160
Change-Id: Id0000000f2a6956c042c883a4545edf347fa1799
Lily Ballard