Code:
on ^*:tabcomp:*:{
  myalias
  haltdef
}

on *:tabcomp:*:{
  myalias
}

alias -l myalias {
  echo -a this code is run everytime a tabcomp is activated, it halts default text and still works if mirc wouldn't complete anything (or give an error)
}


tabcomp bug's that remain:
- If the line is too long, all text after the completed word will be cut off.
- $editbox()/editbox has some issues with spaces (mirc original tabcomp not).
- Things I not remember.

missing: tabcomp in the help-page: halting text