[openstreetmap/openstreetmap-website] Add outlines for in-viewport changeset bboxes (PR #5964)

[Tom Hughes]

@tomhughes commented on this pull request.



> @@ -119,14 +119,12 @@ OSM.HistoryChangesetsLayer = L.FeatureGroup.extend({
     const changeset = this._changesets.get(id);
     if (!changeset) return;
 
-    let highlightRect = this._highlightLayer.getLayer(id);
-    if (!state && highlightRect) {
-      this._highlightLayer.removeLayer(highlightRect);
-    }
-    if (state && !highlightRect) {
-      highlightRect = L.rectangle(changeset.bounds, this._getHighlightStyle(changeset));
+    if (state) {
+      const highlightRect = L.rectangle(changeset.bounds, this._getHighlightStyle(changeset));

So we're now relying on leaflet discard any pre-existing layer with the same ID when we add this one? Is that documented anywhere?

Or is the assumption just that we won't toggle a changeset on that is already on?

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