Merge branch '35955-searchable-settings-puts-expand-collapse-toggle-in-an-invalid-state' into sh-headless-chrome-support

* 35955-searchable-settings-puts-expand-collapse-toggle-in-an-invalid-state:
  Stop sections from expanding when scrolling over the 1px section
  update settings panels to place "expanded" class on the correct element
  remove needlessly complicated, duplicate css class for expanded settings panels