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, 19 insertions, 12 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 72572b05ef6..aee6d798799 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -776,18 +776,7 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
     }
   }
 
-  /**
-   * Versioning code until next subversion bump goes here.
-   *
-   * \note Be sure to check when bumping the version:
-   * - "versioning_userdef.c", #blo_do_versions_userdef
-   * - "versioning_userdef.c", #do_versions_theme
-   *
-   * \note Keep this message at the bottom of the function.
-   */
-  {
-    /* Keep this block, even when empty. */
-
+  if (!MAIN_VERSION_ATLEAST(bmain, 300, 19)) {
     /* Add node storage for subdivision surface node. */
     FOREACH_NODETREE_BEGIN (bmain, ntree, id) {
       if (ntree->type == NTREE_GEOMETRY) {
@@ -818,5 +807,23 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
         }
       }
     }
+
+    LISTBASE_FOREACH (Scene *, scene, &bmain->scenes) {
+      SequencerToolSettings *sequencer_tool_settings = SEQ_tool_settings_ensure(scene);
+      sequencer_tool_settings->overlap_mode = SEQ_OVERLAP_SHUFFLE;
+    }
+  }
+
+  /**
+   * Versioning code until next subversion bump goes here.
+   *
+   * \note Be sure to check when bumping the version:
+   * - "versioning_userdef.c", #blo_do_versions_userdef
+   * - "versioning_userdef.c", #do_versions_theme
+   *
+   * \note Keep this message at the bottom of the function.
+   */
+  {
+    /* Keep this block, even when empty. */
   }
 }