Web app: Middle mouse button hold and drag doesn't scroll

[reginabally]

Expected

I would expect holding the middle mouse button and dragging it would allow me to scroll on the notes.

Observed

I did not see the scroll icon and the action doesn't allow me to scroll on the notes.

Reproduced

1. Open Simplenote web app at https://app.simplenote.com
2. Open a long note (more than a page long)
3. Click on the middle mouse button and hold it while dragging up or down on the notes section
4. The scroll icon doesn't show up and not able to scroll on the note.

Additional testing

The same action doesn't work on other sites (e.g. Google Search results) on Google Chrome browser (version 85.0.4183.1210). However, I was able to apply the middle mouse hold and drag action on Google Search result with Firefox browser (version 81.0).

Please check out the GIF here: https://d.pr/i/rQQ2J6/mTKkBVQoS1

Where did you see the bug

• OS: Windows
• OS version: 10 ver. 1941.508
• Browser (if applicable): Google Chrome
• Browser version (if applicable): 85.0.4183.121
• Simplenote app version: https://app.simplenote.com
• Reported in 3353380-zen.

[codebykat]

Notes from my brief research into this:

• It's called "auto-scrolling"
• There don't seem to be any relevant issues reported in the monaco repository
• @reginabally was kind enough to test on the Monaco playground and is also unable to scroll there in either Firefox or Chrome

Also that weird selection that's happening in the gif is terrifying and bad

[codebykat]

Maybe related, maybe not microsoft/vscode#43794