Incorrect transition values

[msrumon]

If I load this site while the dev tool is opened and docked to the right, and close the dev tool after loading the site, I see this abnormality: Anybody knows why?

I think it's because the package doesn't update the clientWidth (if it's changed) and adjust the transition amount (in px unit). Someone already created a PR about the issue. Looks like nobody's home to merge it.