Fix scrolling in the history window

[rchiodo]

For #5131

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Has sufficient logging.
• Has telemetry for enhancements.
• Unit tests & system/integration tests are added/updated
• Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)
• The wiki is updated with any design decisions/details.

[rchiodo]

@IanMatthewHuff if you can look at this post submit, that would be great. I'm submitting it now so that the insider's build is working for a customer.

[IanMatthewHuff]

@rchiodo . Yeah, figured that my refactor might perturb some things a bit. The scroll to bottom stuff seems a bit funky in general, but this seems like a reasonable fix for it. Thanks.