fix song stop screwing everything up

src/engine/engine.cpp

@@ -401,6 +401,7 @@ void writePackedCommandValues(SafeWriter* w, const DivCommand& c) {
 SafeWriter* DivEngine::saveCommand(bool binary) {
   stop();
   repeatPattern=false;
+  shallStop=false;
   setOrder(0);
   BUSY_BEGIN_SOFT;
   // determine loop point
@@ -1873,6 +1874,7 @@ void DivEngine::play() {
   sPreview.wave=-1;
   sPreview.pos=0;
   sPreview.dir=false;
+  shallStop=false;
   if (stepPlay==0) {
     freelance=false;
     playSub(false);
@@ -2031,6 +2033,7 @@ void DivEngine::reset() {
   speed1=curSubSong->speed1;
   speed2=curSubSong->speed2;
   firstTick=false;
+  shallStop=false;
   nextSpeed=speed1;
   divider=60;
   if (curSubSong->customTempo) {

src/engine/engine.h

@@ -327,6 +327,7 @@ class DivEngine {
   bool lowQuality;
   bool playing;
   bool freelance;
+  bool shallStop;
   bool speedAB;
   bool endOfSong;
   bool consoleMode;
@@ -998,6 +999,7 @@ class DivEngine {
       lowQuality(false),
       playing(false),
       freelance(false),
+      shallStop(false),
       speedAB(false),
       endOfSong(false),
       consoleMode(false),

src/engine/playback.cpp

@@ -844,15 +844,7 @@ void DivEngine::processRow(int i, bool afterDelay) {
         break;
       
       case 0xff: // stop song
-        freelance=false;
-        playing=false;
-        extValuePresent=false;
-        stepPlay=0;
-        remainingLoops=-1;
-        sPreview.sample=-1;
-        sPreview.wave=-1;
-        sPreview.pos=0;
-        sPreview.dir=false;
+        shallStop=true;
         break;
     }
   }
@@ -1285,6 +1277,20 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
 
   firstTick=false;
 
+  if (shallStop) {
+    freelance=false;
+    playing=false;
+    extValuePresent=false;
+    stepPlay=0;
+    remainingLoops=-1;
+    sPreview.sample=-1;
+    sPreview.wave=-1;
+    sPreview.pos=0;
+    sPreview.dir=false;
+    ret=true;
+    return ret;
+  }
+
   // system tick
   for (int i=0; i<song.systemLen; i++) disCont[i].dispatch->tick(subticks==tickMult);