Cache children when traversing to prevent concurrent modification issues

espresso-server/library/src/main/java/io/appium/espressoserver/lib/model/SourceDocument.kt

@@ -41,10 +41,20 @@ import io.appium.espressoserver.lib.viewaction.ViewGetter
 import org.w3c.dom.NodeList
 import org.xml.sax.InputSource
 import org.xmlpull.v1.XmlSerializer
-import java.io.*
-import java.util.*
+import java.io.BufferedReader
+import java.io.ByteArrayInputStream
+import java.io.ByteArrayOutputStream
+import java.io.FileOutputStream
+import java.io.IOException
+import java.io.InputStream
+import java.io.InputStreamReader
+import java.util.UUID
 import java.util.concurrent.Semaphore
-import javax.xml.xpath.*
+import javax.xml.xpath.XPath
+import javax.xml.xpath.XPathConstants
+import javax.xml.xpath.XPathExpression
+import javax.xml.xpath.XPathExpressionException
+import javax.xml.xpath.XPathFactory
 import kotlin.reflect.full.declaredMemberFunctions
 import kotlin.reflect.jvm.isAccessible
 
@@ -240,8 +250,9 @@ class SourceDocument constructor(
 
         if (depth < MAX_TRAVERSAL_DEPTH) {
             // Visit the children and build them too
-            for (index in 0 until semanticsNode.children.count()) {
-                serializeComposeNode(semanticsNode.children[index], depth + 1)
+            val children = semanticsNode.children
+            for (index in 0 until children.count()) {
+                serializeComposeNode(children[index], depth + 1)
             }
         } else {
             AndroidLogger.warn(