Make execution of map-extent's map-projectionchange handler conditional

on the parent layer not being disabled (by a media query). This is a 
break with normal disabled calculation, which for a layer has been 
deduced on the content of the layer being "visible" (within zoom limits, 
map bounds). May break other stuff tbd.

src/map-extent.js

@@ -430,22 +430,27 @@ export class HTMLExtentElement extends HTMLElement {
   }
 
   _handleChange() {
-    // add _extentLayer to map if map-extent is checked, otherwise remove it
-    if (this.checked && !this.disabled) {
-      // can be added to mapmllayer layerGroup no matter map-layer is checked or not
-      this._extentLayer.addTo(this.parentLayer._layer);
-      this._extentLayer.setZIndex(
-        Array.from(
-          this.parentLayer.src
-            ? this.parentLayer.shadowRoot.querySelectorAll(':host > map-extent')
-            : this.parentLayer.querySelectorAll(':scope > map-extent')
-        ).indexOf(this)
-      );
-    } else {
-      this.parentLayer._layer?.removeLayer(this._extentLayer);
+    // parent layer can be disabled due to media query
+    if (!this.parentLayer.disabled) {
+      // add _extentLayer to map if map-extent is checked, otherwise remove it
+      if (this.checked && !this.disabled) {
+        // can be added to mapmllayer layerGroup no matter map-layer is checked or not
+        this._extentLayer.addTo(this.parentLayer._layer);
+        this._extentLayer.setZIndex(
+          Array.from(
+            this.parentLayer.src
+              ? this.parentLayer.shadowRoot.querySelectorAll(
+                  ':host > map-extent'
+                )
+              : this.parentLayer.querySelectorAll(':scope > map-extent')
+          ).indexOf(this)
+        );
+      } else {
+        this.parentLayer._layer?.removeLayer(this._extentLayer);
+      }
+      // change the checkbox in the layer control to match map-extent.checked
+      // doesn't trigger the event handler because it's not user-caused AFAICT
     }
-    // change the checkbox in the layer control to match map-extent.checked
-    // doesn't trigger the event handler because it's not user-caused AFAICT
   }
   _validateLayerControlContainerHidden() {
     let extentsFieldset = this.parentLayer._propertiesGroupAnatomy;