Typing fast on the search box causes web app to stutter

Created by: limitedmage

Repro steps:

1. Navigate to a big page, eg. https://sourcegraph.com/github.com/sourcegraph/sourcegraph/-/compare/HEAD~40...HEAD?visible=90
2. Type fast on the search bar

Expected: typing works fine Actual: web app stutters, typing lags

Every component in the page seems to be re-rendered on every keystroke due to the QueryState changing.

I tried debouncing changes to navbar QueryState, which fixed the stuttering but broke the search box autocomplete.