Tool System: experimental fallback tool support

Implement T66304 as an experimental option,
available under the preferences "Experimental" section.

- When enabled most tools in the 3D view have a gizmo.
- Dragging outside the gizmo uses the 'fallback' tool.
- The fallback tool can be changed or disabled in the tool options
  or from a pie menu (Alt-W).

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_userdef_types.h b/source/blender/makesdna/DNA_userdef_types.h
index eb1b3036767..c26eb58a8f9 100644
--- a/source/blender/makesdna/DNA_userdef_types.h
+++ b/source/blender/makesdna/DNA_userdef_types.h
@@ -607,7 +607,10 @@ typedef struct UserDef_FileSpaceData {
 typedef struct UserDef_Experimental {
   /** #eUserPref_Experimental_Flag options. */
   int flag;
-  char _pad0[4];
+
+  char use_tool_fallback;
+
+  char _pad0[3];
 } UserDef_Experimental;
 
 typedef struct UserDef {