Scroller: navbar height can change

[nexushoratio]

When the page resizes, the text "For Business", can wrap, increasing the height of the navbar, throwing everything off.

Bah.

• Monitor for size changes
• Add Dispatcher for this
• Allow Scroller to take changes
• Implement listeners in a Service
  • Rename ScrollerService
  • Rename anything navBar to navbar for consistency
  • Get details so access to new navbarDispatcher and globals
  • LinkedIn should expose #globals.
  • Implement Scroller: navbar height can change #240 (comment)
    • Use optional chaining with accessing this.#scroller?.activate()
    • Have service take Scroller via setter, empty sets to null
    • Migrate existing primaries to use new setter instead of argument
    • Remove param from ctor
    • Create services for all secondaries
    • Have existing create/destroy code paths update secondary services (what about autoActivate?)
  • Update margins on activate (include toolbar if present as replacement for LinkedInToolbarService?)
  • Add/remove listeners to the dispatcher
  • Can toolbar change size?
• Retire LinkedIn.navbarScrollerFixup()

[nexushoratio]

Rather than make yet another service, it is probably appropriate to roll this into ScrollerService itself. And while doing so, cover what LinkedInToolbarService is doing as well.

This does leave secondary Scrollers in the wind, however.

We can worry about that detail later, but to capture some initial thoughts:

• Always have the secondaries present, and allow it to update base on the fly rather than destroy. Though that would require enhancing to allow a null base, it would definitely simplify the various getters.
• Wrap secondaries with the service anyway, just for the listener parts. Either enhance the the service to update the associated scroller, so we can use addService(), or turn the service on/off ourselves. This seems like the best option.