vstart == vstop fix

diff --git a/custom.cpp b/custom.cpp
index 6cc95db76d19e070dafd535cfefbcc5c48937111..02389a67ddeccf5af073234023de14d3f892e594 100644 (file)
--- a/custom.cpp
+++ b/custom.cpp
@@ -4520,20 +4520,21 @@ static void vdiw_change(uae_u32 v)
        vdiwstate_bpl = v != 0;
 }
 
+/* Take care of the vertical DIW.  */
 static void decide_vline(void)
 {
        bool forceoff = (vb_start_line == 1 && !harddis_v);
+       bool start = vpos == plffirstline && !forceoff;
+       // VB start line forces vertical display window off (if HARDDIS=0)
+       bool end = vpos == plflastline || forceoff;
 
-       /* Take care of the vertical DIW.  */
-       if (vpos == plffirstline && !forceoff) {
+       if (start && !end) {
                if (vdiwstate != diw_states::DIW_waiting_stop) {
                        event2_newevent_xx(-1, CYCLE_UNIT, 1, vdiw_change);
                }
                vdiwstate = diw_states::DIW_waiting_stop;
                SET_LINE_CYCLEBASED;
-       }
-       // VB start line forces vertical display window off (if HARDDIS=0)
-       if (vpos == plflastline || forceoff) {
+       } else if (end) {
                if (vdiwstate != diw_states::DIW_waiting_start) {
                        event2_newevent_xx(-1, CYCLE_UNIT, 0, vdiw_change);
                }