updated for version 7.3.1200

Problem:    When calling setline() from Insert mode, using CTRL-R =, undo does
            not work properly. (Israel Chauca)
Solution:   Sync undo after evaluating the expression. (Christian Brabandt)

src/edit.c

@@ -8126,10 +8126,8 @@ ins_reg()
     --no_mapping;
 
 #ifdef FEAT_EVAL
-    /*
-     * Don't call u_sync() while getting the expression,
-     * evaluating it or giving an error message for it!
-     */
+    /* Don't call u_sync() while typing the expression or giving an error
+     * message for it. Only call it explicitly. */
     ++no_u_sync;
     if (regname == '=')
     {
@@ -8142,6 +8140,9 @@ ins_reg()
 	if (im_on)
 	    im_set_active(TRUE);
 # endif
+	if (regname == '=')
+	    /* sync undo, so the effect of e.g., setline() can be undone */
+	    u_sync(TRUE);
     }
     if (regname == NUL || !valid_yank_reg(regname, FALSE))
     {

src/testdir/test61.in

@@ -84,6 +84,16 @@ ggO---:0put c
 ggO---:0put b
 ggO---:0put a
 ggO---:w >>test.out
+:so small.vim
+:set nocp
+:enew!
+oa
+:set ul=100
+ob
+:set ul=100
+o1a2=setline('.','1234')
+
+uu:%w >>test.out
 :qa!
 ENDTEST
 

src/testdir/test61.ok

@@ -41,3 +41,6 @@ one one one
 two
 two
 three
+
+a
+b

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1200,
 /**/
     1199,
 /**/