The BUG-25876 issue had accidentally stopped reproducing in the latest builds — most likely because the underlying developer tools had been updated. But in this build, it's back again!
It feels like you restored/reapplied your own modifications on top of the Chrome update, and now we're back to square one...
This is extremely inconvenient for developers. This bug has been around for several months, if not years.
It is also known as BS-92008, BUG-24931, and BUG-27619.
https://forums.opera.com/topic/89379/devtools-does-not-resize-the-page-viewport-after-navigation
