re-initialize dispatch if core settings changed

src/engine/engine.cpp

@@ -3916,9 +3916,13 @@ void DivEngine::setConsoleMode(bool enable) {
   consoleMode=enable;
 }
 
-bool DivEngine::switchMaster() {
+bool DivEngine::switchMaster(bool full) {
   logI("switching output...");
   deinitAudioBackend(true);
+  if (full) {
+    quitDispatch();
+    initDispatch();
+  }
   if (initAudioBackend()) {
     for (int i=0; i<song.systemLen; i++) {
       disCont[i].setRates(got.rate);

src/engine/engine.h

@@ -976,7 +976,7 @@ class DivEngine {
     String getPlaybackDebugInfo();
 
     // switch master
-    bool switchMaster();
+    bool switchMaster(bool full=false);
 
     // set MIDI base channel
     void setMidiBaseChan(int chan);

src/gui/settings.cpp

@@ -2594,6 +2594,15 @@ void FurnaceGUI::commitSettings() {
     settings.tg100Path!=e->getConfString("tg100Path","") ||
     settings.mu5Path!=e->getConfString("mu5Path","");
 
+  bool coresChanged=(
+    settings.arcadeCore!=e->getConfInt("arcadeCore",0) ||
+    settings.ym2612Core!=e->getConfInt("ym2612Core",0) ||
+    settings.snCore!=e->getConfInt("snCore",0) ||
+    settings.nesCore!=e->getConfInt("nesCore",0) ||
+    settings.fdsCore!=e->getConfInt("fdsCore",0) ||
+    settings.c64Core!=e->getConfInt("c64Core",1)
+  );
+
   e->setConf("mainFontSize",settings.mainFontSize);
   e->setConf("patFontSize",settings.patFontSize);
   e->setConf("iconSize",settings.iconSize);
@@ -2754,7 +2763,7 @@ void FurnaceGUI::commitSettings() {
     }
   }
 
-  if (!e->switchMaster()) {
+  if (!e->switchMaster(coresChanged)) {
     showError("could not initialize audio!");
   }