Unable to add Blocks at bottom of editor window

[ShaneSchroll]

Describe the bug
When using the Block Editor, If a block is added near the bottom of the editor (creating a scrollbar) there is no way to add more blocks below it aside from using the + sign at the top right of the page.

To reproduce
Steps to reproduce the behavior:

1. Add blocks until the block editor creates a scrollbar
2. Attempt to add a block below the block that caused the scrollbar
3. There is no + sign below that block (and maybe 2px of space before ramming into the bottom of the browser window
4. See error

Expected behavior
A + sign would be shown below the last block on the page along with allowing the editor to scroll beyond the last block (similar to code editors "Scroll beyond last line').

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Windows 10 [Version 10.0.17134.829]
• Browser: Firefox Developer Edition (always up-to-date)
• Version: It updates almost every time I open it. (multiple times a day)

Please add a "Scroll beyond last block" option. This would make the block picker drop down have more room than being smashed against the bottom browser window making selecting blocks very difficult.

[karmatosed]

Thanks for reporting this, whilst I can replicate I did want to comment on the flow. The expectation is you hit return to then open up the ability to add. Personally, whilst I don't think adding a '+' picker is needed there could be some easing here.

I'd love to know what others think about this so marking I can replicate and for feedback.

[kjellr]

We do have #14852 (and the associated PR, #15165 open to address the issue of adding more space at the bottom of the editor.

One possible idea for inserting a subsequent block would be to have the sibling inserter appear on the last block, to give you a clear way to add a subsequent block without necessarily having a full inserter. Currently, it doesn't show up on the last block:

[mapk]

I believe the Typewriter effect fixes this: #16460