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fix: use compgen -P prefix -W '"${arr[@]}"' against patsub_replacement
To add a prefix to every element in an array, we have used the following construct: arr=("${arr[@]/#/$prefix}") However, this can be broken when `shopt -s patsub_replacement` (bash >= 5.2) is turned on. In bash >= 5.2, patsub_replacement is enabled by default. In particular, the characters `&` contained in $prefix, if any, will be replaced with the matched string. To avoid the unexpected patsub_replacement, one may think about quoting the replacement as arr=("${arr[@]/#/"$prefix"}") However, this has another problem in bash < 4.3 or when `shopt -s compat42` is turned on. In such a case, the inner double quotations are treated literally so that the `PREFIX` instead of ``"PREFIX"` is prefixed to elements. To avoid this situation the outer double quotations might be removed, but this has even another problem of the pathname expansions and IFS. We here instead use _comp_compgen: _comp_compgen -Rv arr -- -P "$prefix" -W '"${arr[@]}"' This patch also contains similar cases for a suffix.
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