Map: Add info, if not all available banners are loaded

[tallistroan]

After the initial start of the app, not all available banners are shown immediately on the overview map at small zoom levels.
Show a note, that the user has to zoom in, to see all/more banners. Maybe check somehow, if all banners are loaded and if so, discard that note.

[NineBerry]

I'd propose the following: If the server returns the same number of banners as requested (currently 50), show a marker with a warning symbol in one corner of the map. Title = "Not all banners shown. Zoom in to see more banners". Clicking the button should zoom in one more zoom level

[tallistroan]

Maybe an additional solution to improve performance and usability would be to show banners only for zoom levels e.g. 10+ (similar to the waypoints on the detail map) and otherwise show a note, that the user needs to zoom in to see the banners. But still it would be possible to zoom out and pan quickly to another continent at the map to 'explore' missions somewhere else.

[NineBerry]

Question: Originally we had the idea that the banners returned would be sorted by distance to the center of the map. In this case, the user would see all correct information in the center of the map and missing banners would be at the edge. Can this bis implemented in the backend?