Description: Log unison collisions (that would otherwise be restruck)
Author: mirabilos <m@mirbsd.org>
Forwarded: not-yet
Justification: depends on experiments/revert-restriking-patch.diff

--- a/synthesizer/event.cpp
+++ b/synthesizer/event.cpp
@@ -13,6 +13,7 @@
 #include "libmscore/xml.h"
 #include "libmscore/note.h"
 #include "libmscore/sig.h"
+#include "libmscore/tie.h"
 #include "event.h"
 #include "libmscore/staff.h"
 #include "libmscore/instrument.h"
@@ -396,6 +397,30 @@ void EventList::insert(const Event& e)
 //   class EventMap::fixupMIDI
 //---------------------------------------------------------
 
+static void logCollisionNote(const Note* note, unsigned int indent)
+      {
+      QString info = note->accessibleInfo() + note->accessibleBarbeat();
+      fprintf(stderr, " %*s%s\n", indent, "- ", qPrintable(info));
+      }
+
+static void logCollisionNotes(const NPlayEvent* event)
+      {
+      for (auto it = event->notes.cbegin(); it != event->notes.cend(); ++it) {
+            const Note* note1 = *it;
+            unsigned int indent = /* initial */ 2;
+            while (note1) {
+                  logCollisionNote(note1, indent);
+                  indent += /* linked */ 4;
+                  for (ScoreElement* se : note1->linkList()) {
+                        if (se != note1 && se->isNote())
+                              logCollisionNote(toNote(se), indent);
+                        }
+                  indent -= /* linked */ 4 - /* next level */ 2;
+                  note1 = note1->tieFor() ? note1->tieFor()->endNote() : 0;
+                  }
+            }
+      }
+
 void EventMap::fixupMIDI()
       {
       /* track info for each of the 128 possible MIDI notes */
@@ -431,6 +456,12 @@ void EventMap::fixupMIDI()
                   else if (++np > 1) {
                         /* already playing */
                         discard = true;
+                        /* log the collision */
+                        fprintf(stderr, "MIDI collision detected: newly played...\n");
+                        logCollisionNotes(&event);
+                        fprintf(stderr, " ... interferes with already playing...\n");
+                        logCollisionNotes(info[event.channel()].event[event.pitch()]);
+                        fprintf(stderr, " ... which will continue to sound.\n");
                         /* carry over the corresponding score notes */
                         info[event.channel()].event[event.pitch()]->notes.insert(info[event.channel()].event[event.pitch()]->notes.end(), event.notes.begin(), event.notes.end());
                         }