patch 7.4.1925
Problem:    Viminfo does not merge file marks properly.
Solution:   Use a timestamp.  Add the :clearjumps command.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 55c093f..ad4ba7c 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -474,6 +474,7 @@
 #endif
 #ifndef FEAT_JUMPLIST
 # define ex_jumps		ex_ni
+# define ex_clearjumps		ex_ni
 # define ex_changes		ex_ni
 #endif