MIX_SetTrackGroup: Fixed doubly-linked list state when moving between groups.

icculus · icculus · commit 8c516fcd2eca · 2025-10-30T10:18:53.000-04:00
Fixes #762.
diff --git a/src/SDL_mixer.c b/src/SDL_mixer.c
@@ -2730,6 +2730,7 @@ bool MIX_SetTrackGroup(MIX_Track *track, MIX_Group *group)
         if (oldgroup) {   // remove from current group, if in one.
             if (track->group_prev) {
                 track->group_prev->group_next = track->group_next;
+                track->group_prev = NULL;
             } else {
                 oldgroup->tracks = track->group_next;
             }

Original file line number	Diff line number	Diff line change
`@@ -2730,6 +2730,7 @@ bool MIX_SetTrackGroup(MIX_Track track, MIX_Group group)`
`2730`	`2730`	`if (oldgroup) { // remove from current group, if in one.`
`2731`	`2731`	`if (track->group_prev) {`
`2732`	`2732`	`track->group_prev->group_next = track->group_next;`
	`2733`	`+ track->group_prev = NULL;`
`2733`	`2734`	`} else {`
`2734`	`2735`	`oldgroup->tracks = track->group_next;`
`2735`	`2736`	`}`