updated for version 7.4.445
Problem:    Clipboard may be cleared on startup.
Solution:   Set clip_did_set_selection to -1 during startup. (Christian
            Brabandt)
diff --git a/src/ui.c b/src/ui.c
index 21d92f0..b268cd7 100644
--- a/src/ui.c
+++ b/src/ui.c
@@ -571,7 +571,7 @@
 {
     clip_unnamed_saved = clip_unnamed;
 
-    if (clip_did_set_selection)
+    if (clip_did_set_selection > 0)
     {
 	clip_unnamed = FALSE;
 	clip_did_set_selection = FALSE;
@@ -584,7 +584,7 @@
     void
 end_global_changes()
 {
-    if (!clip_did_set_selection)
+    if (clip_did_set_selection == FALSE)  /* not when -1 */
     {
 	clip_did_set_selection = TRUE;
 	clip_unnamed = clip_unnamed_saved;