fix stack filter

Author: changelcai

matrix/matrix-android/gradle.properties

@@ -14,5 +14,5 @@ org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryErro
 # org.gradle.parallel=true
 #Tue Jun 20 10:24:33 CST 2017
 
-VERSION_NAME_PREFIX=0.5.2.40
+VERSION_NAME_PREFIX=0.5.2.41
 VERSION_NAME_SUFFIX=

matrix/matrix-android/matrix-trace-canary/src/main/java/com/tencent/matrix/trace/util/TraceDataUtils.java

@@ -350,10 +350,10 @@ public int compare(MethodItem o1, MethodItem o2) {
             }
         });
 
-        MethodItem root = stack.get(0);
         if (sortList.isEmpty() && !stack.isEmpty()) {
+            MethodItem root = stack.get(0);
             sortList.add(root);
-        } else if (sortList.size() > 1 && sortList.peek().methodId == root.methodId) {
+        } else if (sortList.size() > 1 && sortList.peek().methodId == AppMethodBeat.METHOD_ID_DISPATCH) {
             sortList.removeFirst();
         }