Fix T48897: Flatten brush fails on first stroke

The flatten brush depended on accumulate being disabled,
Adding dynotopo support for accumulate caused problems for this tool (see T44390).
Enable for existing files.

2 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_270.c b/source/blender/blenloader/intern/versioning_270.c
index ac2811aeb06..8d96d7c3807 100644
--- a/source/blender/blenloader/intern/versioning_270.c
+++ b/source/blender/blenloader/intern/versioning_270.c
@@ -1225,5 +1225,11 @@ void blo_do_versions_270(FileData *fd, Library *UNUSED(lib), Main *main)
 				}
 			}
 		}
+
+		for (Brush *br = main->brush.first; br; br = br->id.next) {
+			if (br->sculpt_tool == SCULPT_TOOL_FLATTEN) {
+				br->flag |= BRUSH_ACCUMULATE;
+			}
+		}
 	}
 }
diff --git a/source/blender/blenloader/intern/versioning_defaults.c b/source/blender/blenloader/intern/versioning_defaults.c
index ad7a3c5b9c4..0ed7a397e0b 100644
--- a/source/blender/blenloader/intern/versioning_defaults.c
+++ b/source/blender/blenloader/intern/versioning_defaults.c
@@ -256,6 +256,11 @@ void BLO_update_defaults_startup_blend(Main *bmain)
 		if (br) {
 			br->alpha = 1.0f;
 		}
+
+		br = (Brush *)BKE_libblock_find_name_ex(bmain, ID_BR, "Flatten/Contrast");
+		if (br) {
+			br->flag |= BRUSH_ACCUMULATE;
+		}
 	}
 }