FIR IDE: Do not try to shorten type without qualifier

idea/idea-fir/tests/org/jetbrains/kotlin/shortenRefs/FirShortenRefsTestGenerated.java

@@ -144,6 +144,11 @@ public class FirShortenRefsTestGenerated extends AbstractFirShortenRefsTest {
             runTest("idea/testData/shortenRefsFir/types/ParameterTypeNestedType.kt");
         }
 
+        @TestMetadata("ParameterTypeNestedTypeWithoutPackageNotShorten.kt")
+        public void testParameterTypeNestedTypeWithoutPackageNotShorten() throws Exception {
+            runTest("idea/testData/shortenRefsFir/types/ParameterTypeNestedTypeWithoutPackageNotShorten.kt");
+        }
+
         @TestMetadata("ParameterTypeNonImportedClass.kt")
         public void testParameterTypeNonImportedClass() throws Exception {
             runTest("idea/testData/shortenRefsFir/types/ParameterTypeNonImportedClass.kt");

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/components/KtFirReferenceShortener.kt

@@ -185,6 +185,9 @@ internal class KtFirReferenceShortener(
             val positionScopes = findScopesAtPosition(wholeTypeElement, namesToImport) ?: return
 
             for ((classId, typeElement) in allClassIds.zip(allTypeElements)) {
+                // if qualifier is null, then this type have no package and thus cannot be shortened
+                if (typeElement.qualifier == null) return
+
                 val firstFoundClass = findFirstClassifierInScopesByName(positionScopes, classId.shortClassName)?.classId
 
                 if (firstFoundClass == classId) {
@@ -234,7 +237,7 @@ internal class KtFirReferenceShortener(
             val singleAvailableProperty = findSinglePropertyInScopesByName(scopes, propertyId.callableName)
 
             if (singleAvailableProperty?.callableId == propertyId) {
-                callsToShorten.add(qualifiedProperty)
+                addElementToShorten(qualifiedProperty)
             }
         }
 
@@ -251,9 +254,13 @@ internal class KtFirReferenceShortener(
             val singleAvailableCallable = findSingleFunctionInScopesByName(scopes, callableId.callableName)
 
             if (singleAvailableCallable?.callableId == callableId) {
-                callsToShorten.add(qualifiedCallExpression)
+                addElementToShorten(qualifiedCallExpression)
             }
         }
+
+        private fun addElementToShorten(element: KtDotQualifiedExpression) {
+            callsToShorten.add(element)
+        }
     }
 }
 

idea/testData/shortenRefsFir/types/ParameterTypeNestedTypeWithoutPackageNotShorten.kt

@@ -0,0 +1,8 @@
+// FIR_COMPARISON
+package test
+
+class T {
+    class TT
+}
+
+<selection>fun foo(t: T.TT) {}</selection>

idea/testData/shortenRefsFir/types/ParameterTypeNestedTypeWithoutPackageNotShorten.kt.after

@@ -0,0 +1,8 @@
+// FIR_COMPARISON
+package test
+
+class T {
+    class TT
+}
+
+fun foo(t: T.TT) {}