Explain to users there is a limit to amount of notes displayed

[danieldegroot2]

Explain to users they may only see a limited amount of notes displayed when they enable the notes layer while not zoomed in closer. This may be done next to the checkbox for the notes layer in the sidebar (the notes button in the menu will usually be pressed when the user is already zoomed in far enough to see all the notes). It may be a static message.

I can understand this is common sense, but if you don't know this, you'll zoom into an area without notes and suddenly see a bunch of notes appear out of nowhere, which may be confusing to the user. Or, you may not see notes of interest to you and miss them because of it. (Also, the data layer already asks the user to zoom in, but the reason is slightly different afaik.)

[AntonKhorev]

The amount of notes displayed is also limited by javascript bugs. Once you receive a note without comments, the client-side code trips over it and stops displaying notes in the area. This bug is easily fixable.

[mmd-osm]

I think we should revisit this one only after fixing #3617 . Most likely that’s the only issue here really.