AA: relax the assertion about referenced ClassId and qualified access

If an import alias is involved, they could be not identical.
Since an import alias ends with a simple identifer, we can simply drop
the first segment of qualified access and try the assertion again.

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/references/FirReferenceResolveHelper.kt

@@ -468,9 +468,31 @@ internal object FirReferenceResolveHelper {
                     referencedClass.classId
                 }
             val qualifiedAccessSegments = qualifiedAccess.fqNameSegments() ?: return referencedSymbolsByFir
-            assert(referencedClassId.asSingleFqName().pathSegments().takeLast(qualifiedAccessSegments.size)
-                       .map { it.identifierOrNullIfSpecial } == qualifiedAccessSegments) {
-                "Referenced classId $referencedClassId should end with qualifiedAccess expression ${qualifiedAccess.text} "
+
+            fun referencedClassIdAndQualifiedAccessMatch(
+                qualifiedAccessSegments: List<String>
+            ): Boolean {
+                val referencedClassIdSegments =
+                    referencedClassId.asSingleFqName().pathSegments()
+                        .takeLast(qualifiedAccessSegments.size)
+                        .map { it.identifierOrNullIfSpecial }
+                return referencedClassIdSegments == qualifiedAccessSegments
+            }
+
+            if (!referencedClassIdAndQualifiedAccessMatch(qualifiedAccessSegments)) {
+                // Referenced ClassId and qualified access (from source PSI) could be not identical if an import alias is involved.
+                // E.g., test.pkg.R.string.hello v.s. coreR.string.hello where test.pkg.R is imported as coreR
+                // Since an import alias ends with a simple identifier (i.e., can't be non-trivial dotted qualifier), we can safely assume
+                // that the first segment of the qualified access could be the import alias if any. Then, we can still compare the
+                // remaining parts.
+                // E.g., coreR.string.hello
+                //   -> string.hello (drop the first segment)
+                //   test.pkg.R.string.hello
+                //   -> string.hello (take last two segments, where the size is determined by the size of qualified access minus 1)
+                qualifiedAccessSegments.removeAt(0)
+                assert(referencedClassIdAndQualifiedAccessMatch(qualifiedAccessSegments)) {
+                    "Referenced classId $referencedClassId should end with qualifiedAccess expression ${qualifiedAccess.text} "
+                }
             }
 
             // In the code below, we always maintain the contract that `classId` and `qualifiedAccess` should stay "in-sync", i.e. they
@@ -534,7 +556,7 @@ internal object FirReferenceResolveHelper {
      * Returns the segments of a qualified access PSI. For example, given `foo.bar.OuterClass.InnerClass`, this returns `["foo", "bar",
      * "OuterClass", "InnerClass"]`.
      */
-    private fun KtDotQualifiedExpression.fqNameSegments(): List<String>? {
+    private fun KtDotQualifiedExpression.fqNameSegments(): MutableList<String>? {
         val result: MutableList<String> = mutableListOf()
         var current: KtExpression = this
         while (current is KtDotQualifiedExpression) {

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/FirLibrarySourceReferenceResolveTestGenerated.java

@@ -184,6 +184,12 @@ public class FirLibrarySourceReferenceResolveTestGenerated extends AbstractRefer
         runTest("analysis/analysis-api/testData/referenceResolve/implicitFunctionalInterfaceInvoke.kt");
     }
 
+    @Test
+    @TestMetadata("importAlias.kt")
+    public void testImportAlias() throws Exception {
+        runTest("analysis/analysis-api/testData/referenceResolve/importAlias.kt");
+    }
+
     @Test
     @TestMetadata("ImportFromRootScope.kt")
     public void testImportFromRootScope() throws Exception {

analysis/analysis-api-fir/tests/org/jetbrains/kotlin/analysis/api/fir/FirSourceReferenceResolveTestGenerated.java

@@ -184,6 +184,12 @@ public class FirSourceReferenceResolveTestGenerated extends AbstractReferenceRes
         runTest("analysis/analysis-api/testData/referenceResolve/implicitFunctionalInterfaceInvoke.kt");
     }
 
+    @Test
+    @TestMetadata("importAlias.kt")
+    public void testImportAlias() throws Exception {
+        runTest("analysis/analysis-api/testData/referenceResolve/importAlias.kt");
+    }
+
     @Test
     @TestMetadata("ImportFromRootScope.kt")
     public void testImportFromRootScope() throws Exception {

analysis/analysis-api/testData/referenceResolve/importAlias.kt

@@ -0,0 +1,20 @@
+// FILE: R.kt
+package test.pkg
+
+class R {
+    class string {
+        companion object {
+            val hello : Int = 42
+        }
+    }
+}
+
+// FILE: main.kt
+
+package test.pkg
+
+import test.pkg.R as coreR
+
+fun box() {
+    val s = core<caret>R.string.hello
+}

analysis/analysis-api/testData/referenceResolve/importAlias.txt

@@ -0,0 +1,2 @@
+Resolved to:
+0: (in test.pkg) class R