Add fit-to-markers / fit-padding / fit-max-zoom attributes to <leaflet-map>.
When fit-to-markers is set the map ignores lat/lng/zoom and fitBounds()es a
box around every locatable layer (getLatLng / getBounds); tile layers and
open popups/tooltips are skipped.
The only reframe trigger is a component registering into the tree -- initial
load and later additions. Panning, zooming, opening a popup and removing a
marker all leave the view untouched. Reframes coalesce onto a microtask so
load produces one fitBounds call, not one per marker.
Buddy