ctl: show the candidates when completion is ambiguousmain

Tab now behaves like bash: it extends the word to the longest common prefix
and prints every candidate as a column list, instead of quietly cycling
through them one per press. Above completion_prompt_limit (100) it asks before
dumping the list.

Candidates are inserted with their spaces escaped, so a completed track name
stays one argument after Enter; the list itself shows the plain name.

0 files changed, 0 insertions, 0 deletions