Fix T97356: Crash when adding adjustment layer strip

Crash was caused by incorrectly assuming, that rendered strip is meta
when editing code in bulk, but this wasn't true and strip had no
channels initialized, which caused crash on NULL dereference.

Correct approach is to find list of channels where on same level as
rendered strip, similar to how `SEQ_get_seqbase_by_seq` function works
for list of strips.

1 files changed, 16 insertions, 0 deletions

diff --git a/source/blender/sequencer/intern/channels.c b/source/blender/sequencer/intern/channels.c
index e8e82af03f5..21e3461c7d0 100644
--- a/source/blender/sequencer/intern/channels.c
+++ b/source/blender/sequencer/intern/channels.c
@@ -81,3 +81,19 @@ bool SEQ_channel_is_muted(const SeqTimelineChannel *channel)
 {
   return (channel->flag & SEQ_CHANNEL_MUTE) != 0;
 }
+
+ListBase *SEQ_get_channels_by_seq(ListBase *seqbase, const Sequence *seq)
+{
+  ListBase *lb = NULL;
+
+  LISTBASE_FOREACH (Sequence *, iseq, seqbase) {
+    if (seq == iseq) {
+      return seqbase;
+    }
+    if ((lb = SEQ_get_channels_by_seq(&iseq->seqbase, seq))) {
+      return lb;
+    }
+  }
+
+  return NULL;
+}