[Feature Request] Reducing style recalculations

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

I'm profiling selectors for my app, and I'm seeing some of Monaco's selectors listed in there.

It's not a big deal, but it looks to me like some selectors should be made more specific. For example:

• .monaco-button-dropdown .monaco-button-dropdown-separator > div
• .monaco-editor .view-zones .view-lines .view-line span
• .quick-input-list .quick-input-list-rows .monaco-highlighted-label span

span and div are very broad selectors, which will be matched against a million unrelated elements over the course of the lifetime of the app, I'd suggest exploring adding a dedicated class to the matched elements and using that class in the selector instead.

Monaco Editor Playground Link

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Monaco Editor Playground Code

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