"shellformat.flag" is ignored

[antichris]

The extension v7.2.8 does not pass the value of shellformat.flag to the shfmt command, at all.

Repro

1. Wrap the shfmt binary in a wrapper that logs the args:

   SHFMT=$(which shfmt)
   mv "$SHFMT" "$SHFMT.bin"
   cat >"$SHFMT" <<-***
   	#!/bin/sh
   	echo "\$(date +%FT%T.%N)" "\$@" >> /tmp/shfmt-args.log
   	"$SHFMT.bin" "\$@"
   	***
   chmod +x "$SHFMT"

2. Set "shellformat.flag" to any valid shfmt flag, e.g., "-p -bn -ci".

3. Invoke the extension as the formatter on any of the supported file types.

4. Inspect the /tmp/shfmt-args.log log file.

5. Cleanup:

   SHFMT=$(which shfmt)
   mv "$SHFMT.bin" "$SHFMT"

Want

File is formatted according to the flag values.

One or more log entries containing the flag values, e.g.:

2026-04-11T00:49:48.741834778 --filename=/home/user/foo/test.sh -i=0 -ln=auto -p -bn -ci -

Got

File is formatted in the default shfmt style.

The flag values are absent from the logs:

2026-04-11T00:49:48.741834778 --filename=/home/user/foo/test.sh -i=0 -ln=auto -