Committing changes within a script

Question

I've noticed that changes made in a script all go into a single action if the user chooses to manually 'undo' the last change.
Also, an event like setting document.selection to null doesn't clear out the selected flags for all selected objects until after the current script ends.
So, if a group is selected and document.selection is set to null then selection.length will be zero but every pageItem in the group will still have selected = true. If I select the same group item again using the script the selected.length won't be 1, it'll be the total number of objects in the selected group. If I start the script with no selection then the selected.length will be 1.
Is there any method to "commit" changes mid-script or do I have to execute commands I want committed as individual actions as separate scripts or separate doJavaScript actions?
Thanks!

Answer 1

I too have noticed with scripts that a single comm+z to undo will undo the whole script. I have not tested with any of you other cases but if you have the app redraw then this undo's OK.
#target illustrator
var docRef = app.activeDocument;
with (docRef) {
     pathItems[0].fillColor = swatches.getByName('CMYK Green').color;
     redraw();
     pathItems[0].fillColor = swatches.getByName('CMYK Cyan').color;
     redraw();
     pathItems[0].fillColor = swatches.getByName('C=15 M=100 Y=90 K=10').color;
     redraw();
You will need those named swatches available to test…