[FIR IDE] Add unwrapping substitution overrides which doesn't affect function's signature

Also, do not use PSI to restore SUBSTITUTION_OVERRIDE function/property
symbols

analysis/analysis-api-impl-base/tests/org/jetbrains/kotlin/analysis/api/impl/base/test/scopes/AbstractSubstitutionOverridesUnwrappingTest.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.analysis.api.impl.base.test.scopes
+
+import org.jetbrains.kotlin.analysis.api.KtAnalysisSession
+import org.jetbrains.kotlin.analysis.api.impl.barebone.test.FrontendApiTestConfiguratorService
+import org.jetbrains.kotlin.analysis.api.impl.barebone.test.expressionMarkerProvider
+import org.jetbrains.kotlin.analysis.api.impl.base.test.symbols.AbstractSymbolTest
+import org.jetbrains.kotlin.analysis.api.symbols.DebugSymbolRenderer
+import org.jetbrains.kotlin.analysis.api.symbols.KtClassLikeSymbol
+import org.jetbrains.kotlin.analysis.api.symbols.KtSymbol
+import org.jetbrains.kotlin.analysis.api.symbols.markers.KtSymbolWithMembers
+import org.jetbrains.kotlin.psi.KtClassLikeDeclaration
+import org.jetbrains.kotlin.psi.KtFile
+import org.jetbrains.kotlin.test.builders.TestConfigurationBuilder
+import org.jetbrains.kotlin.test.directives.ConfigurationDirectives
+import org.jetbrains.kotlin.test.services.TestServices
+
+abstract class AbstractSubstitutionOverridesUnwrappingTest(
+    configurator: FrontendApiTestConfiguratorService
+) : AbstractSymbolTest(configurator) {
+
+    override fun KtAnalysisSession.collectSymbols(ktFile: KtFile, testServices: TestServices): List<KtSymbol> {
+        val declarationUnderCaret = testServices.expressionMarkerProvider.getElementOfTypAtCaret<KtClassLikeDeclaration>(ktFile)
+        val classSymbolUnderCaret = declarationUnderCaret.getSymbol() as KtClassLikeSymbol
+
+        require(classSymbolUnderCaret is KtSymbolWithMembers)
+
+        return classSymbolUnderCaret.getMemberScope().getAllSymbols().toList()
+    }
+
+    override fun KtAnalysisSession.renderSymbolForComparison(symbol: KtSymbol): String {
+        return with(DebugSymbolRenderer) { renderForSubstitutionOverrideUnwrappingTest(symbol) }
+    }
+
+    override fun configureTest(builder: TestConfigurationBuilder) {
+        super.configureTest(builder)
+        with(builder) {
+            defaultDirectives {
+                +ConfigurationDirectives.WITH_STDLIB
+            }
+        }
+    }
+}

analysis/analysis-api-impl-base/tests/org/jetbrains/kotlin/analysis/api/impl/base/test/symbols/AbstractSymbolTest.kt

@@ -35,7 +35,7 @@ abstract class AbstractSymbolTest(configurator: FrontendApiTestConfiguratorServi
             collectSymbols(ktFile, testServices).map { symbol ->
                 PointerWithRenderedSymbol(
                     if (createPointers) symbol.createPointer() else null,
-                    with(DebugSymbolRenderer) { renderExtra(symbol) }
+                    renderSymbolForComparison(symbol)
                 )
             }
         }
@@ -66,12 +66,17 @@ abstract class AbstractSymbolTest(configurator: FrontendApiTestConfiguratorServi
             pointersWithRendered.map { (pointer, expectedRender) ->
                 val restored = pointer!!.restoreSymbol()
                     ?: error("Symbol $expectedRender was not restored")
-                with(DebugSymbolRenderer) { renderExtra(restored) }
+
+                renderSymbolForComparison(restored)
             }
         }
         val actual = restored.joinToString(separator = "\n\n")
         testServices.assertions.assertEqualsToTestDataFileSibling(actual)
     }
+
+    protected open fun KtAnalysisSession.renderSymbolForComparison(symbol: KtSymbol): String {
+        return with(DebugSymbolRenderer) { renderExtra(symbol) }
+    }
 }
 
 private object SymbolTestDirectives : SimpleDirectivesContainer() {