[openstreetmap/openstreetmap-website] Add `autoPan`-ing for draggin markers on the diary adding page (PR #7188)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> +      if (!map) return;
+
+      const point = map.project(this.getLngLat()),
+            { clientWidth, clientHeight } = map.getContainer();
+
+      let dx = 0,
+          dy = 0;
+      if (point.x < edgeDistance) dx = point.x - edgeDistance;
+      else if (point.x > clientWidth - edgeDistance) dx = point.x - (clientWidth - edgeDistance);
+      if (point.y < edgeDistance) dy = point.y - edgeDistance;
+      else if (point.y > clientHeight - edgeDistance) dy = point.y - (clientHeight - edgeDistance);
+      if (!dx && !dy) return;
+
+      const clamp = (v) => Math.max(-maxPanStep, Math.min(maxPanStep, v));
+      map.panBy([clamp(dx), clamp(dy)], { duration: 0 });
+      this.setLngLat(map.unproject(point));

Well one of the deltas has to be non-zero to arrive at the clamping stage in the first place.

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