KT IDE: use proper package symbol PSI to fix invalidated access exception

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/symbols/KtFirPackageSymbol.kt

@@ -9,11 +9,13 @@ import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiManager
 import com.intellij.psi.impl.file.PsiPackageImpl
+import com.intellij.psi.search.GlobalSearchScope
 import org.jetbrains.kotlin.idea.frontend.api.ValidityTokenOwner
 import org.jetbrains.kotlin.idea.frontend.api.ValidityToken
 import org.jetbrains.kotlin.idea.frontend.api.fir.KtFirAnalysisSession
 import org.jetbrains.kotlin.idea.frontend.api.fir.utils.cached
 import org.jetbrains.kotlin.idea.frontend.api.symbols.*
+import org.jetbrains.kotlin.idea.stubindex.PackageIndexUtil
 import org.jetbrains.kotlin.name.FqName
 
 class KtFirPackageSymbol(
@@ -22,7 +24,7 @@ class KtFirPackageSymbol(
     override val token: ValidityToken
 ) : KtPackageSymbol(), ValidityTokenOwner {
     override val psi: PsiElement? by cached {
-        PsiPackageImpl(PsiManager.getInstance(project), fqName.asString().replace('/', '.'))
+        KtPackage(PsiManager.getInstance(project), fqName, GlobalSearchScope.allScope(project)/*TODO*/)
     }
 
     override val origin: KtSymbolOrigin
@@ -32,4 +34,14 @@ class KtFirPackageSymbol(
         check(session is KtFirAnalysisSession)
         session.firSymbolBuilder.createPackageSymbolIfOneExists(fqName)
     }
-}
+}
+
+class KtPackage(
+    manager: PsiManager,
+    private val fqName: FqName,
+    private val scope: GlobalSearchScope
+) : PsiPackageImpl(manager, fqName.asString().replace('/', '.')) {
+    override fun copy() = KtPackage(manager, fqName, scope)
+
+    override fun isValid(): Boolean = PackageIndexUtil.packageExists(fqName, scope, project)
+}