VSE: Transform overwrite mode

Add mode to overwrite strips on overlap instead of resolving overlap.

When overlap is created, 3 things can happen:
 - On partial overlap, handles of overlapped strip are moved
 - On complete overlap with smaller strip, overlapped strip is split
 - On complete overlap with larger strip, overlapped strip is removed

This mode can be enabled in header.

Reviewed By: fsiddi, mano-wii

Differential Revision: https://developer.blender.org/D11805

1 files changed, 7 insertions, 4 deletions

diff --git a/source/blender/sequencer/SEQ_iterator.h b/source/blender/sequencer/SEQ_iterator.h
index 055db07f646..9fca25653e1 100644
--- a/source/blender/sequencer/SEQ_iterator.h
+++ b/source/blender/sequencer/SEQ_iterator.h
@@ -34,10 +34,12 @@ struct GSet;
 struct GSetIterator;
 struct Sequence;
 
-#define SEQ_ITERATOR_FOREACH(var, collection) \
-  for (SeqIterator iter = {{{NULL}}}; \
-       SEQ_iterator_ensure(collection, &iter, &var) && var != NULL; \
-       var = SEQ_iterator_yield(&iter))
+#define SEQ_ITERATOR_FOREACH_IMPL(var, collection, suffix) \
+  for (SeqIterator iter##suffix = {{{NULL}}}; \
+       SEQ_iterator_ensure(collection, &iter##suffix, &var) && var != NULL; \
+       var = SEQ_iterator_yield(&iter##suffix))
+
+#define SEQ_ITERATOR_FOREACH(var, collection) SEQ_ITERATOR_FOREACH_IMPL(var, collection, __LINE__)
 
 typedef struct SeqCollection {
   struct GSet *set;
@@ -79,6 +81,7 @@ SeqCollection *SEQ_query_by_reference(struct Sequence *seq_reference,
                                                           struct ListBase *seqbase,
                                                           SeqCollection *collection));
 SeqCollection *SEQ_query_selected_strips(struct ListBase *seqbase);
+SeqCollection *SEQ_query_unselected_strips(struct ListBase *seqbase);
 SeqCollection *SEQ_query_all_strips(struct ListBase *seqbase);
 SeqCollection *SEQ_query_all_strips_recursive(struct ListBase *seqbase);
 void SEQ_query_strip_effect_chain(struct Sequence *seq_reference,