updated for version 7.4.419

Problem:    Whan part of a list is locked it's possible to make changes.
Solution:   Check if any of the list items is locked before make a change.
            (ZyX)

src/eval.c

@@ -2945,6 +2945,23 @@ set_var_lval(lp, endp, rettv, copy, op)
 	;
     else if (lp->ll_range)
     {
+	listitem_T *ll_li = lp->ll_li;
+	int ll_n1 = lp->ll_n1;
+
+	/*
+	 * Check whether any of the list items is locked
+	 */
+	for (ri = rettv->vval.v_list->lv_first; ri != NULL; )
+	{
+	    if (tv_check_lock(ll_li->li_tv.v_lock, lp->ll_name))
+		return;
+	    ri = ri->li_next;
+	    if (ri == NULL || (!lp->ll_empty2 && lp->ll_n2 == ll_n1))
+		break;
+	    ll_li = ll_li->li_next;
+	    ++ll_n1;
+	}
+
 	/*
 	 * Assign the List values to the list items.
 	 */
@@ -3646,6 +3663,17 @@ do_unlet_var(lp, name_end, forceit)
     else if (lp->ll_range)
     {
 	listitem_T    *li;
+	listitem_T    *ll_li = lp->ll_li;
+	int           ll_n1 = lp->ll_n1;
+
+	while (ll_li != NULL && (lp->ll_empty2 || lp->ll_n2 >= ll_n1))
+	{
+	    li = ll_li->li_next;
+	    if (tv_check_lock(ll_li->li_tv.v_lock, lp->ll_name))
+		return FAIL;
+	    ll_li = li;
+	    ++ll_n1;
+	}
 
 	/* Delete a range of List items. */
 	while (lp->ll_li != NULL && (lp->ll_empty2 || lp->ll_n2 >= lp->ll_n1))

src/testdir/test55.in

@@ -282,6 +282,21 @@ let l = [0, 1, 2, 3]
 :    $put =ps
 :  endfor
 :endfor
+:unlet l
+:let l = [1, 2, 3, 4]
+:lockvar! l
+:$put =string(l)
+:unlockvar l[1]
+:unlet l[0:1]
+:$put =string(l)
+:unlet l[1:2]
+:$put =string(l)
+:unlockvar l[1]
+:let l[0:1] = [0, 1]
+:$put =string(l)
+:let l[1:2] = [0, 1]
+:$put =string(l)
+:unlet l
 :" :lockvar/islocked() triggering script autoloading
 :set rtp+=./sautest
 :lockvar g:footest#x

src/testdir/test55.ok

@@ -86,6 +86,11 @@ FFFFFFF
 FFpFFpp
 0000-000
 ppppppp
+[1, 2, 3, 4]
+[1, 2, 3, 4]
+[1, 2, 3, 4]
+[1, 2, 3, 4]
+[1, 2, 3, 4]
 locked g:footest#x:-1
 exists g:footest#x:0
 g:footest#x: 1

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    419,
 /**/
     418,
 /**/