Easy indention in task-descriptions

I've been using quire for a little while now and totally love it. I've tried dozens of other task managers but none of them comes close to quire. What I use it for is organizing the development of a program I'm making and I write quite a bit of pseudo-code in the descriptions, inside markdown-codeblocks. One thing that I kept feeling I missed was the ability to easily indent rows. Mostly for the code, but also to put things on the right level in nested lists.

I actually just made a script to do just this in quire and thought maybe you'd be interested in it? Maybe even consider adding it to quire? I'm using the chrome-extension Tampermonkey to load it automatically when i open quire. To try it one could also copy&paste and execute in the code in the developer panel.

To then make use of it, just highlight some text then do ctrl+left or ctrl+right.

The code could definitely be cleaned up and improved upon, but it works - at least in chrome which is the only browser I've tried.

If it's of any interest at all I'd be happy to fix it and make it function properly corss-browser.

$(function(){$('#task-unit .u-desc-input')./*unbind("keydown").*/keydown(indention);});
    function indention(e) {
        if (e.ctrlKey&&!e.shiftKey) {
            if (e.keyCode===37||e.keyCode===39) {
                indent(e.target,e.keyCode===39);
                e.preventDefault();
            }
        }
    }
    function indent(element,right) {
        var text=element.value;
        var rows=text.split("\n");
        var selStart=element.selectionStart;
        var selEnd=element.selectionEnd;
        var indentionPositions=[];
        for (var selPosStartEnd=0; selPosStartEnd<2; selPosStartEnd++) {
            var selPos=selPosStartEnd?element.selectionEnd:element.selectionStart;
            var searchPos=0;
            for (var rowI=0; rowI<rows.length; rowI++) {
                var rowLength=rows[rowI].length+1;
                if (searchPos+rowLength>selPos) {
                    indentionPositions[selPosStartEnd]=searchPos;
                    break;
                }
                searchPos+=rowLength;
            }
        }
        if (!right)
            indentionPositions[1]+=rowLength;
        var indentionPart=text.slice(indentionPositions[0],indentionPositions[1]);
        var indentionPartOldLength=indentionPart.length;
        if (right) {
            indentionPart=indentionPart.replace(/(^|\r?\n|\r)/g, "$1  ");
        }  else  {
            indentionPart=indentionPart.replace(/(^|\r?\n|\r)  /g, "$1");
        }
        element.value=text.slice(0,indentionPositions[0])+indentionPart+text.slice(indentionPositions[1]);
        element.setSelectionRange(indentionPositions[0], indentionPositions[1]+indentionPart.length-indentionPartOldLength+(right?rowLength-1:-1));
        return text;
    }

Also attaching the Tampermonkey-file.