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, 8 insertions, 0 deletions

diff --git a/source/blender/sequencer/intern/sequencer.c b/source/blender/sequencer/intern/sequencer.c
index 2863af8fb2e..a62b76cd832 100644
--- a/source/blender/sequencer/intern/sequencer.c
+++ b/source/blender/sequencer/intern/sequencer.c
@@ -323,6 +323,8 @@ SequencerToolSettings *SEQ_tool_settings_init(void)
   tool_settings->snap_mode = SEQ_SNAP_TO_STRIPS | SEQ_SNAP_TO_CURRENT_FRAME |
                              SEQ_SNAP_TO_STRIP_HOLD;
   tool_settings->snap_distance = 15;
+  tool_settings->overlap_mode = SEQ_OVERLAP_SHUFFLE;
+
   return tool_settings;
 }
 
@@ -372,6 +374,12 @@ void SEQ_tool_settings_fit_method_set(Scene *scene, eSeqImageFitMethod fit_metho
   tool_settings->fit_method = fit_method;
 }
 
+eSeqOverlapMode SEQ_tool_settings_overlap_mode_get(Scene *scene)
+{
+  const SequencerToolSettings *tool_settings = SEQ_tool_settings_ensure(scene);
+  return tool_settings->overlap_mode;
+}
+
 /**
  * Get seqbase that is being viewed currently. This can be main seqbase or meta strip seqbase
  *