updated for version 7.3.392

Problem:    When setting 'undofile' while the file is already loaded but
            unchanged, try reading the undo file. (Andy Wokula)
Solution:   Compute a checksum of the text when 'undofile' is set. (Christian
            Brabandt)

src/testdir/test72.in

@@ -51,6 +51,12 @@ dd:set ul=100
 :e Xtestfile
 uuu:w >>test.out
 :"
+:" Test that reading the undofiles when setting undofile works
+:set noundofile ul=0
+i
+u:e! Xtestfile
+:set undofile ul=100
+uuuuuu:w >>test.out
 :" And now with encryption, cryptmethod=zip
 :e! Xtestfile
 :set undofile cm=zip

src/testdir/test72.ok

@@ -7,6 +7,16 @@ seven
 eight
 nine
 ten
+one
+two
+three
+four
+five
+six
+seven
+eight
+nine
+ten
 monday
 wednesday
 thursday