Release the map view and the controller when the map leaves the composition

src/main/java/com/mapconductor/longdo/LongdoMapView.kt

@@ -530,6 +530,17 @@ fun LongdoMapSurface(
         onDispose {
             moveDispatcher.cancel()
             controller.destroy()
+            // No MapViewBase here to do it: the state (which the app keeps) must
+            // not hold on to the destroyed controller and its overlays.
+            state.detachController(controller)
+            // The WebView is the map. Not destroyed, it keeps its renderer and
+            // the JS bridge, and through them the controller with every overlay.
+            // This runs for a configuration change too: the old Activity's
+            // WebView is never shown again (the state is what survives).
+            (longdoMap.parent as? ViewGroup)?.removeView(longdoMap)
+            longdoMap.removeJavascriptInterface(BRIDGE_NAME)
+            longdoMap.stopLoading()
+            longdoMap.destroy()
         }
     }
 }

src/main/java/com/mapconductor/longdo/LongdoViewStateImpl.kt

@@ -38,7 +38,10 @@ class LongdoViewState(
     LongdoViewStateInterface {
     private var _mapDesignType by mutableStateOf(mapDesignType)
 
-    private var controller: LongdoMapViewController? = null
+    // Read through the base so that letting go of the controller there (MapViewBase
+    // does it when the map is torn down) leaves nothing behind here.
+    private val controller: LongdoMapViewController?
+        get() = attachedMapController as? LongdoMapViewController
 
     override var mapDesignType: LongdoMapDesignTypeInterface
         get() = _mapDesignType
@@ -49,7 +52,6 @@ class LongdoViewState(
 
     /** MapView 生成時にコントローラを紐付ける。 */
     fun setController(controller: LongdoMapViewController) {
-        this.controller = controller
         // 初期カメラは LongdoMap.LOCATION として地図読み込み前に渡すので、接続時には移動しない。
         attachController(controller, moveToInitialCamera = false)
     }