IDEA-164271 "Simplifiable conditional usage of Map.get()" doesn't recognize proper pattern with adding additional parentheses

java/java-tests/testData/inspection/java8MapGet/afterComputeIfAbsentSingleLineParens.java

@@ -0,0 +1,11 @@
+// "Replace with 'computeIfAbsent' method call" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  public void testMap(Map<String, List<String>> map, String key, String value) {
+      List<String> list = map.computeIfAbsent(key, k -> new ArrayList<>());
+      list.add(value);
+  }
+}

java/java-tests/testData/inspection/java8MapGet/beforeComputeIfAbsentSingleLineParens.java

@@ -0,0 +1,14 @@
+// "Replace with 'computeIfAbsent' method call" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  public void testMap(Map<String, List<String>> map, String key, String value) {
+    List<String> list = map.get(key);
+    if(list == nul<caret>l) {
+      map.put(key, (list = new ArrayList<>()));
+    }
+    list.add(value);
+  }
+}

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/psiutils/ExpressionUtils.java

@@ -727,10 +727,13 @@ public class ExpressionUtils {
     if(element instanceof PsiExpressionStatement) {
       element = ((PsiExpressionStatement)element).getExpression();
     }
-    if (element instanceof PsiAssignmentExpression) {
-      PsiAssignmentExpression assignment = (PsiAssignmentExpression)element;
-      if(assignment.getOperationTokenType().equals(JavaTokenType.EQ)) {
-        return assignment;
+    if (element instanceof PsiExpression) {
+      element = PsiUtil.skipParenthesizedExprDown((PsiExpression)element);
+      if (element instanceof PsiAssignmentExpression) {
+        PsiAssignmentExpression assignment = (PsiAssignmentExpression)element;
+        if(assignment.getOperationTokenType().equals(JavaTokenType.EQ)) {
+          return assignment;
+        }
       }
     }
     return null;