Fix KML ground overlays never rendering

geoxml3 looks up ProjectedOverlay on window, but ResourceLoader runs module
scripts inside a function, where the declaration never becomes global, so
every GroundOverlay threw. Export it the way geoxml3.js exports geoXML3.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: JeroenDeDauw

RELEASE-NOTES.md

@@ -9,6 +9,7 @@ Released on July 31st, 2026.
 
 * Fixed a stored XSS vulnerability in the Google Maps service, where content from KML files loaded via the `kml` parameter was used to build map popups without sanitization, and a `NetworkLink` refresh URL was evaluated as code ([GHSA-rg4f-xvhj-mw22](https://github.com/ProfessionalWiki/Maps/security/advisories/GHSA-rg4f-xvhj-mw22))
 * KML popups are now limited to safe HTML: frames, objects and scripts embedded in KML descriptions are no longer rendered
+* Fixed `GroundOverlay` images in KML files never rendering
 
 ## Maps 14.1.0
 

resources/GoogleMaps/geoxml3/ProjectedOverlay.js

@@ -157,3 +157,8 @@ ProjectedOverlay.prototype.setRotation=function(deg)
 	this.div_.style.oTransform      = 'rotate('+deg+'deg)';
 	this.div_.style.transform       = 'rotate('+deg+'deg)';
 }
+
+// Local modification (Maps extension): geoxml3 looks this constructor up on window, but
+// ResourceLoader runs module scripts inside a function, where a declaration does not become
+// global. Export it the way geoxml3.js exports geoXML3, or ground overlays never render.
+window.ProjectedOverlay = ProjectedOverlay;

resources/GoogleMaps/geoxml3/README

@@ -15,4 +15,7 @@ code of its own:
 * geoxml3.js: the NetworkLink refresh schedules a call instead of a string for setInterval to evaluate.
 * ProjectedOverlay.js: draw() builds the ground overlay image with the DOM API instead of an HTML string.
 
+ProjectedOverlay.js additionally exports its constructor on window, because ResourceLoader runs module
+scripts inside a function, where the declaration geoxml3.js looks for never becomes global.
+
 All are marked with a "Local modification" comment. Keep them when updating the library.