[Analysis API] Add IGNORE_SELF dangling file resolution mode

In the 'IGNORE_SELF' mode, dangling files don't have their own
declarations in providers. As a result, all references there resolve to
declarations of the original file. It is conceptually similar to that we
had in on-air resolve, however, now it's possible to work with the whole
content of the in-memory 'FirFile'.

As it can be seen in 'ProjectStructureProvider.kt'
(KtFile.danglingFileResolutionMode), the 'IGNORE_SELF' mode is
automatically applied for non-physical files with an original file being
set. For other scenarios, now there is a new 'analyzeCopy()' function
that allows to pass the analysis mode explicitly.

analysis/analysis-test-framework/tests/org/jetbrains/kotlin/analysis/test/framework/base/AbstractAnalysisApiBasedTest.kt

@@ -11,7 +11,8 @@ import com.intellij.testFramework.TestDataFile
 import junit.framework.ComparisonFailure
 import org.jetbrains.kotlin.analysis.api.KtAnalysisSession
 import org.jetbrains.kotlin.analysis.api.analyze
-import org.jetbrains.kotlin.analysis.api.analyzeInDependedAnalysisSession
+import org.jetbrains.kotlin.analysis.api.analyzeCopy
+import org.jetbrains.kotlin.analysis.project.structure.DanglingFileResolutionMode
 import org.jetbrains.kotlin.analysis.test.framework.AnalysisApiTestDirectives
 import org.jetbrains.kotlin.analysis.test.framework.TestWithDisposable
 import org.jetbrains.kotlin.analysis.test.framework.project.structure.ktModuleProvider
@@ -205,12 +206,10 @@ abstract class AbstractAnalysisApiBasedTest : TestWithDisposable() {
         return if (configurator.analyseInDependentSession) {
             val originalContainingFile = contextElement.containingKtFile
             val fileCopy = originalContainingFile.copy() as KtFile
-            val sameElementInCopy = PsiTreeUtil.findSameElementInCopy(contextElement, fileCopy)
-            analyzeInDependedAnalysisSession(
-                originalContainingFile,
-                sameElementInCopy,
-                action = { action(sameElementInCopy) }
-            )
+
+            analyzeCopy(fileCopy, DanglingFileResolutionMode.IGNORE_SELF) {
+                action(PsiTreeUtil.findSameElementInCopy<KtElement>(contextElement, fileCopy))
+            }
         } else {
             analyze(contextElement, action = { action(contextElement) })
         }

analysis/analysis-test-framework/tests/org/jetbrains/kotlin/analysis/test/framework/services/KtTestProjectStructureProvider.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.analysis.api.standalone.base.project.structure.KtMod
 import org.jetbrains.kotlin.analysis.api.standalone.base.project.structure.KtStaticProjectStructureProvider
 import org.jetbrains.kotlin.analysis.project.structure.*
 import org.jetbrains.kotlin.config.LanguageVersionSettings
-import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.psiUtil.contains
 import org.jetbrains.kotlin.serialization.deserialization.builtins.BuiltInSerializerProtocol
 import org.jetbrains.kotlin.utils.KotlinExceptionWithAttachments
@@ -29,9 +28,7 @@ class KtTestProjectStructureProvider(
 
     @OptIn(KtModuleStructureInternals::class)
     override fun getModule(element: PsiElement, contextualModule: KtModule?): KtModule {
-        // Unwrap context-dependent file copies coming from dependent sessions
-        val containingFile = element.containingFile.originalFile
-
+        val containingFile = element.containingFile
         val virtualFile = containingFile.virtualFile
 
         if (virtualFile != null) {