src/extensions/default/CodeFolding/foldhelpers/foldgutter.js
function getFoldOnLine(cm, line) {
        var pos = CodeMirror.Pos(line, 0);
        var folds = cm.findMarksAt(pos) || [];
        folds = folds.filter(isFold);
        return folds.length ? folds[0] : undefined;
    }
function getFoldOnLine(cm, line) {
        var pos = CodeMirror.Pos(line, 0);
        var folds = cm.findMarksAt(pos) || [];
        folds = folds.filter(isFold);
        return folds.length ? folds[0] : undefined;
    }
function getFoldOnLine ( cm , line ) { var pos = CodeMirror . Pos ( line , 0 ) ; var folds = cm . findMarksAt ( pos ) || [ ] ; folds = folds . filter ( isFold ) ; return folds . length ? folds [ 0 ] : undefined ; }
Helper function to return the fold text marker on a line in an editor
@param   {CodeMirror} cm   The CodeMirror instance for the active editor
@param   {Number}     line The line number representing the position of the fold marker
@returns {TextMarker} A CodeMirror TextMarker object
Helper function to return the fold text marker on a line in an editor