+++ This bug was initially created as a clone of Bug #1469959 +++ STRs: - open console - log an object with many properties, eg `document` - expand the object - scrolldown until you see `prototype` - expand prototype ER: prototype is expanded AR: viewport scrolls to show the beginning of the object, prototype is not expanded --- This is a new regression, which I think was caused by https://github.com/devtools-html/debugger.html/pull/6809. There was a good reason the test was failing and Bug 1484672 should not have been done (blame's on me 🤦‍♀️).

In https://github.com/devtools-html/debugger.html/pull/6809 a check was removed in the Tree component because seens as unnecessary, and a test was modified to accomodate the change. Turns out the test was needed in its original form, and was surfacing a bug. This patch rolls back both the change in the Tree component _and_ in the test. The Tree modification will be backported to the Github repository.

Comment on attachment 9004136 [details] Bug 1486364 - Revert changes in Tree component and test; r=jdescottes. Julian Descottes [:jdescottes][:julian] has approved the revision.

Pushed by nchevobbe@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/5ccb4b6527c1 Revert changes in Tree component and test; r=jdescottes.