Gutenberg: Popup vs. popup with inline block inserter and toolbar block inserter

[haszari]

Describe the bug

In Gutenberg you can add blocks from the toolbar block inserter and also from a keyboard-shortcut when typing a /.

It's possible to have both inserters display at the same time, overlapping each other, which is confusing.

To reproduce

1. Edit a page or post in block editor.
2. Click in content are and type / to bring up inline inserter.
3. Realise you have no clue what text to type to get the block you want, so mouse up to toolbar and click the big plus.

Expected behavior
There should only be one popup visible on screen at a time, and it should be focused. Or, the most recently opened one should be fully visible.

Screenshots
(Screenshot above)

Editor version (please complete the following information):

• WordPress version: 5.4.1
• Does the website has Gutenberg plugin installed, or is it using the block editor that comes by default? default

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome
• Version: 81.0.4044.129

[annezazu]

Thanks for this report @haszari! I was able to replicate this using just 5.4.1. Flagging this for the team! To be safe, I tested this with Gutenberg 8.1 RC (no experiments) and WordPress 5.4.1 only to find what seems to be an even worse duplication happening:

Here's a video: https://cloudup.com/cPQ3YL6U_Xh

[youknowriad]

I think this is invalid now that the inserter shows up as a panel.