Describe the bug
A clear and concise description of what the bug is.
The dropdown menu on the global types that are defined in the menu is displayed with black text on a black background when using a Mac with dark theme.

To Reproduce
Steps to reproduce the behavior:

1. Install the Storybook a11y add-on or define a global type
2. Set Mac to dark theme
3. Click on one of the menus

By default ember-cli updates a number of the "app trees" to be from tests/dummy when developing an addon locally. We do this for app, styles, templates, public, and tests trees (handled inside lib/broccoli/ember-addon.js).

Unfortunately, we do not forward the apps vendor tree to tests/dummy/. This means that our addon's treeForVendor is called, but then subsequently clobbered by the "apps

Feature Request

If you don't set your environment's URL options, generated URLs will contain example.com which is only handy if you're working on the new example.com.

Is your feature request related to a problem?

This comes up frequently on Discord, even though it is documented: https://docs

Is your feature request related to a problem? Please describe.
I understand Ember Inspector is for the development and Debugging phase. And I am of the opinion that, having access to the private (by convention, underscore prefixed) fields/property is a very useful feature when hunting for problems like why a certain computed property based on other field and property have an unexpected value.

It got lost early in some v4 release candidate. Original content could be found here: https://github.com/kaliber5/ember-bootstrap/blob/b711738bba95fd9523e573e5e314f4cf7257f93f/addon/components/base/bs-button.js#L183-L191 It could be used as a starter.

Reported by @rwwagner90 here: kaliber5/ember-bootstrap#1110 (comment)