source/blender/blenkernel/BKE_blender_version.h

@@ -29,7 +29,7 @@ extern "C" {
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 8
+#define BLENDER_FILE_SUBVERSION 9
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and cancel loading the file, showing a warning to

source/blender/blenkernel/intern/armature.cc

@@ -2578,6 +2578,12 @@ static int rebuild_pose_bone(
   pchan->bone = bone;
   pchan->parent = parchan;
 
+  /* Prevent custom bone colors from having alpha zero.
+   * Part of the fix for issue #115434. */
+  pchan->color.custom.solid[3] = 255;
+  pchan->color.custom.select[3] = 255;
+  pchan->color.custom.active[3] = 255;
+
   /* We ensure the current pchan is immediately after the one we just generated/updated in the
    * previous call to `rebuild_pose_bone`.
    *

source/blender/blenloader/intern/versioning_400.cc

@@ -1759,6 +1759,16 @@ static void versioning_grease_pencil_stroke_radii_scaling(GreasePencil *grease_p
   }
 }
 
+static void version_ensure_opaque_bone_colors_recursive(Bone *bone)
+{
+  bone->color.custom.solid[3] = 255;
+  bone->color.custom.select[3] = 255;
+  bone->color.custom.active[3] = 255;
+  LISTBASE_FOREACH (Bone *, child_bone, &bone->childbase) {
+    version_ensure_opaque_bone_colors_recursive(child_bone);
+  }
+}
+
 void blo_do_versions_400(FileData *fd, Library * /*lib*/, Main *bmain)
 {
   if (!MAIN_VERSION_FILE_ATLEAST(bmain, 400, 1)) {
@@ -2485,18 +2495,8 @@ void blo_do_versions_400(FileData *fd, Library * /*lib*/, Main *bmain)
       versioning_nodes_dynamic_sockets(*ntree);
     }
   }
-  /**
-   * Versioning code until next subversion bump goes here.
-   *
-   * \note Be sure to check when bumping the version:
-   * - #do_versions_after_linking_400 in this file.
-   * - `versioning_userdef.cc`, #blo_do_versions_userdef
-   * - `versioning_userdef.cc`, #do_versions_theme
-   *
-   * \note Keep this message at the bottom of the function.
-   */
-  {
-    /* Keep this block, even when empty. */
+
+  if (!MAIN_VERSION_FILE_ATLEAST(bmain, 401, 9)) {
     LISTBASE_FOREACH (bNodeTree *, ntree, &bmain->nodetrees) {
       if (ntree->type == NTREE_GEOMETRY) {
         version_geometry_nodes_use_rotation_socket(*ntree);
@@ -2528,5 +2528,44 @@ void blo_do_versions_400(FileData *fd, Library * /*lib*/, Main *bmain)
         material->displacement_method = displacement_method;
       }
     }
+
+    /* Prevent custom bone colors from having alpha zero.
+     * Part of the fix for issue #115434. */
+    LISTBASE_FOREACH (bArmature *, arm, &bmain->armatures) {
+      LISTBASE_FOREACH (Bone *, bone, &arm->bonebase) {
+        version_ensure_opaque_bone_colors_recursive(bone);
+      }
+      if (arm->edbo) {
+        LISTBASE_FOREACH (EditBone *, ebone, arm->edbo) {
+          ebone->color.custom.solid[3] = 255;
+          ebone->color.custom.select[3] = 255;
+          ebone->color.custom.active[3] = 255;
+        }
+      }
+    }
+    LISTBASE_FOREACH (Object *, obj, &bmain->objects) {
+      if (obj->pose == nullptr) {
+        continue;
+      }
+      LISTBASE_FOREACH (bPoseChannel *, pchan, &obj->pose->chanbase) {
+        pchan->color.custom.solid[3] = 255;
+        pchan->color.custom.select[3] = 255;
+        pchan->color.custom.active[3] = 255;
+      }
+    }
+  }
+
+  /**
+   * Versioning code until next subversion bump goes here.
+   *
+   * \note Be sure to check when bumping the version:
+   * - #do_versions_after_linking_400 in this file.
+   * - `versioning_userdef.cc`, #blo_do_versions_userdef
+   * - `versioning_userdef.cc`, #do_versions_theme
+   *
+   * \note Keep this message at the bottom of the function.
+   */
+  {
+    /* Keep this block, even when empty. */
   }
 }

source/blender/editors/armature/armature_add.cc

@@ -83,6 +83,12 @@ EditBone *ED_armature_ebone_add(bArmature *arm, const char *name)
   bone->ease1 = 1.0f;
   bone->ease2 = 1.0f;
 
+  /* Prevent custom bone colors from having alpha zero.
+   * Part of the fix for issue #115434. */
+  bone->color.custom.solid[3] = 255;
+  bone->color.custom.select[3] = 255;
+  bone->color.custom.active[3] = 255;
+
   copy_v3_fl(bone->scale_in, 1.0f);
   copy_v3_fl(bone->scale_out, 1.0f);
 
@@ -1522,6 +1528,8 @@ static int armature_extrude_exec(bContext *C, wmOperator *op)
               }
             }
 
+            newbone->color = ebone->color;
+
             newbone->weight = ebone->weight;
             newbone->dist = ebone->dist;
             newbone->xwidth = ebone->xwidth;