Scrolling Map to the Edge Results in Black Screen Covering Entire Viewport

[Djkt2005]

Description

When the map is scrolled to its edge and the scrolling continues beyond the map bounds, a black screen appears. If scrolling persists, the entire viewport turns black, making the application unusable until it is refreshed or restarted. This significantly impacts the user experience, especially during navigation or exploration tasks.

The expected behavior should have been for the map to stop scrolling or display a proper boundary indication.

Steps to Recreate

1. Open the application and load the map interface.
2. Scroll the map towards any edge of the available map bounds.
3. Continue scrolling beyond the edge.
4. Observe that a black screen starts appearing and eventually covers the entire viewport.

Is this expected or a bug?

Screenshots

[Djkt2005]

This is causing a bad user experience, I would like to fix this bug.

[tyrasd]

Agree that limiting the panning to the map projection limits would make sense.

I would like to fix this bug.

Sure, give it a try!

[tyrasd]

A related issue would be to prevent osm nodes from being created outside of the +/-180° / +/-90° bounds: currently, iD does not prevent one from creating such nodes, but the OSM API will not accept such coordinates when trying to upload a changeset containing these.