Fix new occurrences of extension_.

compiler/src/dotty/tools/dotc/quoted/QuoteContextImpl.scala

@@ -29,9 +29,9 @@ object QuoteContextImpl {
   def showDecompiledTree(tree: tpd.Tree)(using Context): String = {
     val qctx: QuoteContextImpl = new QuoteContextImpl(MacroExpansion.context(tree))
     if ctx.settings.color.value == "always" then
-      qctx.reflect.TreeMethodsImpl.extension_showAnsiColored(tree)
+      qctx.reflect.TreeMethodsImpl.temporaryShowAnsiColored(tree)
     else
-      qctx.reflect.TreeMethodsImpl.extension_show(tree)
+      qctx.reflect.TreeMethodsImpl.temporaryShow(tree)
   }
 
   private[dotty] def checkScopeId(id: ScopeId)(using Context): Unit =

library/src/scala/tasty/Reflection.scala

@@ -140,6 +140,10 @@ trait Reflection { reflection =>
   protected val TreeMethodsImpl: TreeMethods
 
   trait TreeMethods {
+    // Dodo: Drop once extension methods have stabilized
+    def temporaryShowAnsiColored(self: Tree): String = self.showAnsiColored
+    def temporaryShow(self: Tree): String = self.show
+
     extension (self: Tree):
       /** Position in the source code */
       def pos: Position