[FIR] Trim rendered symbols in diagnostic messages

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/diagnostics/FirDiagnosticRenderers.kt

@@ -37,7 +37,7 @@ object FirDiagnosticRenderers {
                 callArgumentsRenderer = FirCallNoArgumentsRenderer(),
                 modifierRenderer = FirPartialModifierRenderer(),
                 valueParameterRenderer = FirValueParameterRendererNoDefaultValue(),
-            ).renderElementAsString(symbol.fir)
+            ).renderElementAsString(symbol.fir, trim = true)
             is FirTypeParameterSymbol -> symbol.name.asString()
             else -> "???"
         }
@@ -109,7 +109,7 @@ object FirDiagnosticRenderers {
         @OptIn(SymbolInternals::class)
         FirRenderer(
             annotationRenderer = null, bodyRenderer = null, idRenderer = ConeIdFullRenderer()
-        ).renderElementAsString(symbol.fir)
+        ).renderElementAsString(symbol.fir, trim = true)
     }
 
     val AMBIGUOUS_CALLS = Renderer { candidates: Collection<FirBasedSymbol<*>> ->

compiler/fir/tree/src/org/jetbrains/kotlin/fir/renderer/FirRenderer.kt

@@ -28,6 +28,7 @@ import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
 import org.jetbrains.kotlin.name.StandardClassIds
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.util.OperatorNameConventions
+import org.jetbrains.kotlin.utils.addToStdlib.applyIf
 import java.util.*
 
 class FirRenderer(
@@ -88,9 +89,9 @@ class FirRenderer(
         fileAnnotationsContainerRenderer?.components = this
     }
 
-    fun renderElementAsString(element: FirElement): String {
+    fun renderElementAsString(element: FirElement, trim: Boolean = false): String {
         element.accept(visitor)
-        return printer.toString()
+        return printer.toString().applyIf(trim, String::trim)
     }
 
     fun renderElementWithTypeAsString(element: FirElement): String {