Cached map tiles not accessible in offline mode #1791
Description
Current Behavior: Map tiles are cached but not usable offline; shows empty grid
Expected Behavior: Cached tiles should display when offline
As far as I can tell Aves caches map tiles from base layers. I have concluded this from following observations:
- Viewing new map area increases occupied cache space
- If area have been already viewed, its map shows faster
But these cached tiles are not used in offline mode. If there is no internet connection then map viewer shows empty grid.
This is even worse for "OSM Liberty". Without internet connection it shows this:
It seems to me that https://tile.ourmap.us/data/v3.json is fetched before each showing of this layer. For instance, it seems to load slower on unstable connection, like slow 3G.
Consider caching the v3.json file to avoid blocking display of already-cached tiles