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, 0 deletions

diff --git a/source/blender/makesdna/DNA_workspace_types.h b/source/blender/makesdna/DNA_workspace_types.h
index dbfb0cc6346..573b076542e 100644
--- a/source/blender/makesdna/DNA_workspace_types.h
+++ b/source/blender/makesdna/DNA_workspace_types.h
@@ -35,6 +35,10 @@ typedef struct bToolRef_Runtime {
   char gizmo_group[64];
   char data_block[64];
 
+  /** Optionally use these when not interacting directly with the primary tools gizmo. */
+  char idname_fallback[64];
+  char keymap_fallback[64];
+
   /** Use to infer primary operator to use when setting accelerator keys. */
   char op[64];