fix(model-sync-lib): fixed potential index out of bounds

Could occur when moving across parents

Author: mhuster23

model-sync-lib/src/main/kotlin/org/modelix/model/sync/ModelImporter.kt

@@ -218,8 +218,8 @@ class ModelImporter(private val root: INode, val stats: ImportStats? = null) {
 
         toBeMovedHere.forEach {nodeToBeMoved ->
             val spec = originalIdToSpec[nodeToBeMoved.originalId()]!!
-
-            val baseTargetIndex = spec.getIndexWithinRole(nodeData, existingChildren.lastIndex)
+            val childrenInRole = existingChildren.filter { it.roleInParent == spec.role }
+            val baseTargetIndex = spec.getIndexWithinRole(nodeData, childrenInRole.lastIndex)
             val offset = existingChildren.slice(0 until baseTargetIndex).count {
                 !originalIdToSpec.containsKey(it.originalId()) // node will be deleted
             }