If a completion function generates multiple matches that share a prefix (or
are even identical) and contain some invalid characters, these characters
are not treated as being part of the shared prefix.
For example:
bind 'set completion-ignore-case off'
LC_ALL=en_US.UTF-8
complete -F f f
f() { COMPREPLY=($'a\200ax' $'a\200ay'); }
f [TAB] # completes to "a" only
# \200 part not highlighted in list of matches
f a�[TAB] # completes to "a" only
# \200 is removed from line
f() { COMPREPLY=($'a\200' $'a\200'); }
f [TAB] # completes to "a" only
# only one possible completion is (correctly) displayed
Or, if the filesystem supports such names:
touch a$'\200'{x,y}
cat a[TAB]
cat a�[TAB]
Turning on completion-ignore-case or setting LC_ALL=C makes all of the above
work as expected.
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