readd replace_it func

Author: Wulian233

Lib/idlelib/replace.py

@@ -86,6 +86,13 @@ def find_it(self, event=None):
         "Handle the Find button."
         self.do_find(False)
 
+    def replace_it(self, event=None): 
+         """Handle the Replace button. 
+  
+         If the find is successful, then perform replace. 
+         """ 
+         if self.do_find(self.ok): 
+             self.do_replace()
 
     def default_command(self, event=None):
         """Handle the Replace+Find button as the default command.