Clickings in `cm-scroller` outside `cm-content` remove the focus status

[exuanbo]

Describe the issue

Browser and platform

macOS 10.15.7, Chrome 117.0.5938.88

Reproduction link

https://codemirror.net/try/

[marijnh]

That recently regressed. Attached patch fixes it again.

[arthur5005]

Patch only fixes it for left click, doesn't fix for right click it seems, for anyone landing here who might be interested, a followup bug was submitted here: #1277