updated for version 7.3.1303

Problem:    Undo is synced whenever CTRL-R = is called, breaking some plugins.
Solution:   Only break undo when calling setline() or append().

src/testdir/test61.in

@@ -93,7 +93,17 @@ ob
 :set ul=100
 o1a2=setline('.','1234')
 
-uu:%w >>test.out
+uu:"
+oc
+:set ul=100
+o1a2=setline('.','1234')
+
+u:"
+od
+:set ul=100
+o1a2=string(123)
+u:"
+:%w >>test.out
 :qa!
 ENDTEST
 

src/testdir/test61.ok

@@ -44,3 +44,6 @@ three
 
 a
 b
+c
+12
+d