After https://codereview.chromium.org/2156413002, opening a sub-page in a section may cause the section to jump upward when it begins to expand, depending on the scroll position and overscroll amount.

Repro example: open chrome://md-settings, scroll to the bottom, and click "Manage Search Engines".

I've tried to fix  issue 633046 , from the same CL, but that doesn't seem to help with this issue, so it may have a different solution.