--- a/mercurial/simplemerge.py	Mon Mar 21 10:55:50 2022 +0100
+++ b/mercurial/simplemerge.py	Tue Jan 18 13:05:21 2022 -0800
@@ -490,6 +490,9 @@
             self._text = self.fctx.decodeddata()
         return self._text
 
+    def set_text(self, text):
+        self._text = text
+
 
 def simplemerge(
     local,