Don't process qualified targets in PyRedeclarationInspection (PY-26591)

python/src/com/jetbrains/python/inspections/PyRedeclarationInspection.java

@@ -79,7 +79,7 @@ public class PyRedeclarationInspection extends PyInspection {
 
     @Override
     public void visitPyTargetExpression(final PyTargetExpression node) {
-      if (PyNames.UNDERSCORE.equals(node.getText())) return;
+      if (node.isQualified() || PyNames.UNDERSCORE.equals(node.getText())) return;
       final ScopeOwner owner = ScopeUtil.getScopeOwner(node);
       if (owner instanceof PyFile || owner instanceof PyClass) {
         processElement(node);

python/testData/inspections/PyRedeclarationInspection/qualifiedTarget.py

@@ -0,0 +1,3 @@
+a = 10
+b = 10
+a.b = 10

python/testSrc/com/jetbrains/python/inspections/PyRedeclarationInspectionTest.java

@@ -125,6 +125,11 @@ public class PyRedeclarationInspectionTest extends PyInspectionTestCase {
     doTest();
   }
 
+  // PY-26591
+  public void testQualifiedTarget() {
+    doTest();
+  }
+
   @NotNull
   @Override
   protected Class<? extends PyInspection> getInspectionClass() {