sortLayoutItemsByRowCol returning different results in Edge/IE 11-10

[guntherjh]

Hello,
First off, I'd like to say thanks for creating such a great library! It really has been quite fun to work with!

I noticed that I was getting inconsistent ordering of layout items across browsers, particularly in Edge/IE (11-10) vs Chrome/Firefox. After a couple of hours of debugging, I think I tracked down where the discrepancy is happening. It looks like the callback passed to sort() in sortLayoutItemsByRowCol() is returning different results based on browser. I recreated the problem here:

https://codepen.io/guntherjh/pen/qaKLNY

If you open the pen in Chrome vs Edge/IE 11-10, you'll see that the resulting array contains items in different order depending on browser.

Once again, thanks for all your hard work in creating a such a great library and please let me know if you need any further details from me.

[STRML]

Very interesting! I believe the issue is the lack of an equality case.

This adjustment appears to produce consistent results:

https://codepen.io/anon/pen/bwKOJB

[STRML]

I can confirm this fixes the issue in IE10. Do you have other VMs or machines handy so you could check in IE11/Edge?

[guntherjh]

I am actually on a Windows machine. I confirmed your modification fixes the issue in Edge and IE 11. Thanks for the quick response!

[STRML]

Great. I'll merge it in.

[guntherjh]

Awesome! Thanks again for your help!