fix(model-client): each call to ReplicatedModelJS.getBranch added another listener

Author: slisson

model-client/src/jsMain/kotlin/org/modelix/model/client2/MutableModelTreeJsImpl.kt

@@ -35,6 +35,7 @@ internal class MutableModelTreeJsImpl(
 
     init {
         tree.addListener(changeListener)
+        // TODO missing removeListener call
     }
 
     override val rootNode: INodeJS

model-client/src/jsMain/kotlin/org/modelix/model/client2/ReplicatedModelJSImpl.kt

@@ -10,12 +10,15 @@ import org.modelix.model.mutable.withAutoTransactions
 import kotlin.js.Promise
 
 internal class ReplicatedModelJSImpl(private val model: ReplicatedModel) : ReplicatedModelJS {
+
+    private val mutableModelTree = MutableModelTreeJsImpl(model.getVersionedModelTree().withAutoTransactions())
+
     override fun dispose() {
         model.dispose()
     }
 
     override fun getBranch(): MutableModelTreeJs {
-        return MutableModelTreeJsImpl(model.getVersionedModelTree().withAutoTransactions())
+        return mutableModelTree
     }
 
     override fun getCurrentVersionInformation(): Promise<VersionInformationJS> {