IDEA-89838 (Configure inspection "'size() == 0' replaceable with 'isEmpty()'" to not flag inside custom implementations of Collection.)

plugins/InspectionGadgets/src/com/siyeh/ig/style/SizeReplaceableByIsEmptyInspection.java

@@ -22,6 +22,7 @@ import com.intellij.openapi.project.Project;
 import com.intellij.psi.*;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.InheritanceUtil;
+import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.containers.OrderedSet;
 import com.intellij.util.ui.CheckBox;
@@ -209,6 +210,9 @@ public class SizeReplaceableByIsEmptyInspection extends BaseInspection {
       if (aClass == null) {
         return null;
       }
+      if (PsiTreeUtil.isAncestor(aClass, callExpression, true)) {
+        return null;
+      }
       for (String ignoredType : ignoredTypes) {
         if (InheritanceUtil.isInheritor(aClass, ignoredType)) {
           return null;

plugins/InspectionGadgets/test/com/siyeh/igtest/style/size_replaceable_by_is_empty/SizeReplaceableByIsEmpty.java

@@ -25,4 +25,12 @@ public class SizeReplaceableByIsEmpty {
       return false;
     }
   }
+
+  abstract class MyList<T> implements java.util.List<T>
+  {
+    public boolean isEmpty()
+    {
+      return this.size() == 0;
+    }
+  }
 }