element list hides element tree with deeply nested elements

[jackgeek]

When inspecting deeply nested elements, which my application has a lot of, the tool becomes unusable because the component tree gets hidden by the list below it. Please see screenshot below

spicyj mentioned possibly changing this here.

If the list below was to have a scroll bar or something that limits its size this would make it more usable.

[sophiebits]

Happy to take a PR for this.

[gaearon]

This was fixed in #511.