gh-43720: IDLE - use tk text print when available

The new tk print command is available in tk 9.0.  When running
tk 8.6, fall back to old code.

Author: terryjreedy

Lib/idlelib/iomenu.py

@@ -326,6 +326,12 @@ def encode(self, chars):
         return chars.encode('utf-8-sig')
 
     def print_window(self, event):
+        try:
+            self.text.tk.call('tk', 'print', self.text)
+        except tkinter.TclError:
+            self.old_print(event)
+
+    def old_print(self, event):
         confirm = messagebox.askokcancel(
                   title="Print",
                   message="Print to Default Printer",