PY-47304 Keep showing direct (non-fuzzy) module attributes after dot in completion

Previously, we accidentally offered immediate attributes of a module only right
after a dot in a non-imported qualified name (i.e., with an empty attribute name).
If a qualified name of a fuzzy variant matched that of a direct attribute, it went
unnoticed. However, if a name was non-trivially exported, as in case of
"_pytest.mark.structures.MARK_GEN" exported as "pytest.mark", its expected name,
as an attribute of pytest module, disappeared immediately as one started typing
anything past the dot in "pytest.".

GitOrigin-RevId: 5fbd7bd77fd1629f4d852b757d350cc182b991d7

python/python-psi-impl/src/com/jetbrains/python/codeInsight/completion/PyUnresolvedModuleAttributeCompletionContributor.kt

@@ -119,7 +119,7 @@ class PyUnresolvedModuleAttributeCompletionContributor : CompletionContributor()
           .filter { it.containingFile != null }
           .filterNot { it is PsiFileSystemItem }
           .filterNot { it.name == null || it.name!!.startsWith('_') }
-          .filter { attribute.isEmpty() || resultMatchingCompleteReference.prefixMatcher.prefixMatches(it.name!!) }
+          .filter { attribute.isEmpty() || resultMatchingCompleteReference.prefixMatcher.prefixMatches("$packageName.${it.name}") }
           .mapNotNull {
             val qualifiedNameToSuggest = "$qualifier.${it.name}"
             if (suggestedQualifiedNames.add(qualifiedNameToSuggest)) {

python/testData/completion/notImportedQualifiedName/DirectModuleAttributesSuggestedForNonEmptyAttributePrefix/_impl.py

@@ -0,0 +1,2 @@
+def bar():
+    pass

python/testData/completion/notImportedQualifiedName/DirectModuleAttributesSuggestedForNonEmptyAttributePrefix/foo.py

@@ -0,0 +1 @@
+from _impl import bar

python/testData/completion/notImportedQualifiedName/DirectModuleAttributesSuggestedForNonEmptyAttributePrefix/main.after.py

@@ -0,0 +1,3 @@
+import foo
+
+foo.bar()

python/testData/completion/notImportedQualifiedName/DirectModuleAttributesSuggestedForNonEmptyAttributePrefix/main.py

@@ -0,0 +1 @@
+foo.ba<caret>

python/testSrc/com/jetbrains/python/PyNotImportedQualifiedNameCompletionTest.java

@@ -75,38 +75,30 @@ public class PyNotImportedQualifiedNameCompletionTest extends PyTestCase {
   }
 
   public void testImportForModuleFunction() {
-    final String testName = getTestName(false);
-    myFixture.copyDirectoryToProject(testName, "");
-    myFixture.configureByFile("main.py");
-    myFixture.completeBasic();
-    myFixture.checkResultByFile(testName + "/main.after.py");
+    doTestBasicCompletion();
   }
 
   public void testImportForModuleClass() {
-    final String testName = getTestName(false);
-    myFixture.copyDirectoryToProject(testName, "");
-    myFixture.configureByFile("main.py");
-    myFixture.completeBasic();
-    myFixture.checkResultByFile(testName + "/main.after.py");
+    doTestBasicCompletion();
   }
 
   public void testImportForAlias() {
-    final String testName = getTestName(false);
-    myFixture.copyDirectoryToProject(testName, "");
-    myFixture.configureByFile("main.py");
-    myFixture.completeBasic();
-    myFixture.checkResultByFile(testName + "/main.after.py");
+    doTestBasicCompletion();
   }
 
   public void testImportForAliasWithNonEmptyAttribute() {
-    final String testName = getTestName(false);
-    myFixture.copyDirectoryToProject(testName, "");
-    myFixture.configureByFile("main.py");
-    myFixture.completeBasic();
-    myFixture.checkResultByFile(testName + "/main.after.py");
+    doTestBasicCompletion();
   }
 
   public void testUseImportPriorityWhenAddingImport() {
+    doTestBasicCompletion();
+  }
+
+  public void testDirectModuleAttributesSuggestedForNonEmptyAttributePrefix() {
+    doTestBasicCompletion();
+  }
+
+  private void doTestBasicCompletion() {
     final String testName = getTestName(false);
     myFixture.copyDirectoryToProject(testName, "");
     myFixture.configureByFile("main.py");