Increase VSE strip channels limit from 32 to 128

The original limit dates back from 2002 when Blender went open source.
After that many years some productions (e.g., Sprite Fright) are already
experiencing limitations for complex edits.

The future plans is to support an initial shorter (2?) number of
channels with support to "unlimited" channels.

Finally, I'm bumping the minimum file requirement since files with more
than 32 channels won't work well in old Blender versions.

In a future commit I will implement a sanitization so that we only read (and write)
128 channels. Making sure future changes of this number won't corrupt Blender.

Differential Revision: https://developer.blender.org/D12645

3 files changed, 34 insertions, 28 deletions

diff --git a/source/blender/blenkernel/BKE_blender_version.h b/source/blender/blenkernel/BKE_blender_version.h
index 1f25106404a..6f7e6363a37 100644
--- a/source/blender/blenkernel/BKE_blender_version.h
+++ b/source/blender/blenkernel/BKE_blender_version.h
@@ -39,13 +39,13 @@ extern "C" {
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 25
+#define BLENDER_FILE_SUBVERSION 26
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and show a warning if the file
  * was written with too new a version. */
 #define BLENDER_FILE_MIN_VERSION 300
-#define BLENDER_FILE_MIN_SUBVERSION 11
+#define BLENDER_FILE_MIN_SUBVERSION 26
 
 /** User readable version string. */
 const char *BKE_blender_version_string(void);
diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 692c114d206..aceba82a657 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -505,20 +505,7 @@ void do_versions_after_linking_300(Main *bmain, ReportList *UNUSED(reports))
     }
   }
 
-  /**
-   * Versioning code until next subversion bump goes here.
-   *
-   * \note Be sure to check when bumping the version:
-   * - #blo_do_versions_300 in this file.
-   * - "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. */
-    do_versions_idproperty_ui_data(bmain);
-
+  if (!MAIN_VERSION_ATLEAST(bmain, 300, 26)) {
     LISTBASE_FOREACH (Scene *, scene, &bmain->scenes) {
       ToolSettings *tool_settings = scene->toolsettings;
       ImagePaintSettings *imapaint = &tool_settings->imapaint;
@@ -535,6 +522,7 @@ void do_versions_after_linking_300(Main *bmain, ReportList *UNUSED(reports))
         imapaint->clone = NULL;
       }
     }
+
     LISTBASE_FOREACH (Brush *, brush, &bmain->brushes) {
       if (brush->clone.image != NULL &&
           ELEM(brush->clone.image->type, IMA_TYPE_R_RESULT, IMA_TYPE_COMPOSITE)) {
@@ -542,6 +530,21 @@ void do_versions_after_linking_300(Main *bmain, ReportList *UNUSED(reports))
       }
     }
   }
+
+  /**
+   * Versioning code until next subversion bump goes here.
+   *
+   * \note Be sure to check when bumping the version:
+   * - #blo_do_versions_300 in this file.
+   * - "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. */
+    do_versions_idproperty_ui_data(bmain);
+  }
 }
 
 static void version_switch_node_input_prefix(Main *bmain)
@@ -1453,17 +1456,7 @@ 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, 26)) {
     LISTBASE_FOREACH (Object *, ob, &bmain->objects) {
       LISTBASE_FOREACH (ModifierData *, md, &ob->modifiers) {
         if (md->type == eModifierType_Nodes) {
@@ -1515,4 +1508,17 @@ 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. */
+  }
 }
\ No newline at end of file
diff --git a/source/blender/makesdna/DNA_sequence_types.h b/source/blender/makesdna/DNA_sequence_types.h
index 25330acd486..86369ff7684 100644
--- a/source/blender/makesdna/DNA_sequence_types.h
+++ b/source/blender/makesdna/DNA_sequence_types.h
@@ -486,7 +486,7 @@ typedef struct SequencerScopes {
   struct ImBuf *histogram_ibuf;
 } SequencerScopes;
 
-#define MAXSEQ 32
+#define MAXSEQ 128
 
 #define SELECT 1