message: fix setTabStopWidth
diff: @@ -75,7 +75,7 @@ void SyntaxFile::SetupDocument(QPlainTextEdit* editor){
  if(formatObj.contains("tab_width")){
  int num = formatObj.value("tab_width").toInt();
  if(num<=0){ num = 8; } //UNIX Standard of 8 characters per tab
  - editor->setTabStopWidth( num * QFontMetrics(editor->document()->defaultFont()).width(" ") );
  + editor->setTabStopDistance( num * QFontMetricsF(editor->document()->defaultFont() ).width(" ") );
  }
  }
  