I tested your code from post #2 roughly 10 hours after you posted. The results you can see in my screenshots in post #3 (which I also edited in slightly afterwards)

Note how the width is not adjusted while the msgbox shows, no matter if I wait a minute before clicking OK, and is only updated after the script ends.

Does it not do so when you try running the script in your installation? This is getting even weirder (not sure if that's possible)