`ZoneNames` is the seam; `IcuZoneNames` is the only file in the app allowed to
name `android.icu`, and a build rule keeps it that way. Every read is guarded —
ICU returning blank or throwing gives back null rather than a half-written
city.
`ZoneDirectory` caches the catalog, the entries and the display names, all
keyed on the locale tag, so a per-app language change re-resolves every name
instead of leaving the cities in the old language under a freshly translated
zone name. It answers in batches, so a tab with two dozen cities costs two
dispatches a tick rather than two dozen.
makiolaj
a7a5b64137