Fixed resolving star imports for nested packages with __all__ (PY-13585)

python/src/com/jetbrains/python/psi/impl/PyFileImpl.java

@@ -477,9 +477,13 @@ public class PyFileImpl extends PsiFileBase implements PyFile, PyExpression {
     if (starImportSource != null) {
       starImportSource = PyUtil.turnDirIntoInit(starImportSource);
       if (starImportSource instanceof PyFile) {
-        final PsiElement result = ((PyFile)starImportSource).getElementNamed(name);
+        final PyFile file = (PyFile)starImportSource;
+        final PsiElement result = file.getElementNamed(name);
         if (result != null) {
-          return result;
+          final List<String> dunderAll = file.getDunderAll();
+          if ((dunderAll == null && !name.startsWith("_")) || (dunderAll != null && dunderAll.contains(name))) {
+            return result;
+          }
         }
       }
     }

python/testData/inspections/PyUnresolvedReferencesInspection/UnusedImportBeforeStarDunderAll/a.py

@@ -0,0 +1,3 @@
+import b
+<warning descr="Unused import statement">from p1 import *</warning>
+print(b)

python/testData/inspections/PyUnresolvedReferencesInspection/UnusedImportBeforeStarDunderAll/p1/__init__.py

@@ -0,0 +1 @@
+from p1.m1 import *

python/testData/inspections/PyUnresolvedReferencesInspection/UnusedImportBeforeStarDunderAll/p1/m1.py

@@ -0,0 +1,2 @@
+import b
+__all__ = []

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

@@ -376,6 +376,11 @@ public class PyUnresolvedReferencesInspectionTest extends PyInspectionTestCase {
     doMultiFileTest();
   }
 
+  // PY-13585
+  public void testUnusedImportBeforeStarDunderAll() {
+    doMultiFileTest();
+  }
+
   @NotNull
   @Override
   protected Class<? extends PyInspection> getInspectionClass() {