How to ensure the key object remains stationary (at the first of sel)?

Hi ​@rob day

I have selected multiple objects.
Previously, the object farthest to the left was always the first one, but now I’ve added a condition:
If there is no key object, sort by the leftmost object.
If there is a key object, set `sel[0]` to that key object; the others don’t matter.

The original code seems to have been written by ​@m1b  , and I don’t know how to modify it:

    var d = app.activeDocument;
    var item = d.selection[0];
    var items = d.selection; 
var sel=items;
var key=0;
        for (i = 0; i < sel.length; i++) {
            if (sel[i] == app.selectionKeyObject) {
                key = sel[i];
            }
// Key object exists
if(key!=0){



}

// No key object
    if (items.length > 1&&key==0) {
        sel.sort(function (a, b) {
            var aBounds = a.visibleBounds;
            var bBounds = b.visibleBounds;
            // Compare left boundaries; if left boundaries match, compare top boundaries (0.5 is the allowed error margin)
            if (aBounds[1] < bBounds[1] + 0.5) {
                return -1;
            } else if (aBounds[1] > bBounds[1] + 0.5) {
                return 1;
            } else {
                return aBounds[0] - bBounds[0];
            }
        });
    }

It turns out you need to use move.

The ideal approach, of course, is to keep keyobj stationary while aligning the elements before and after it.
This seems difficult.