Gizmo: optional custom orientations for transform

This aims to resolve a conflict where some users want to keep keyboard
axis setting global, even when the orientation is set to something else.

Move/rotate/scale can optionally each have a separate orientation.

Some UI changes will be made next.

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -64,6 +64,17 @@ class _template_widget:
             props = tool.gizmo_group_properties("VIEW3D_GGT_xform_extrude")
             layout.prop(props, "axis_type", expand=True)
 
+    class TRANSFORM_GGT_gizmo:
+        @staticmethod
+        def draw_settings_with_index(context, layout, index):
+            row = layout.row(align=True)
+            scene = context.scene
+            orientation_slot = scene.transform_orientation_slots[index]
+            value = orientation_slot.use
+            row.prop(orientation_slot, "use", text="", icon='LINKED' if value else 'UNLINKED')
+            if not value:
+                row.prop(orientation_slot, "type", text="")
+
 
 class _defs_view3d_generic:
     @ToolDef.from_fn
@@ -202,6 +213,8 @@ class _defs_transform:
 
     @ToolDef.from_fn
     def translate():
+        def draw_settings(context, layout, tool):
+            _template_widget.TRANSFORM_GGT_gizmo.draw_settings_with_index(context, layout, 1)
         return dict(
             text="Move",
             # cursor='SCROLL_XY',
@@ -209,10 +222,13 @@ class _defs_transform:
             widget="TRANSFORM_GGT_gizmo",
             operator="transform.translate",
             keymap="3D View Tool: Move",
+            draw_settings=draw_settings,
         )
 
     @ToolDef.from_fn
     def rotate():
+        def draw_settings(context, layout, tool):
+            _template_widget.TRANSFORM_GGT_gizmo.draw_settings_with_index(context, layout, 2)
         return dict(
             text="Rotate",
             # cursor='SCROLL_XY',
@@ -220,10 +236,13 @@ class _defs_transform:
             widget="TRANSFORM_GGT_gizmo",
             operator="transform.rotate",
             keymap="3D View Tool: Rotate",
+            draw_settings=draw_settings,
         )
 
     @ToolDef.from_fn
     def scale():
+        def draw_settings(context, layout, tool):
+            _template_widget.TRANSFORM_GGT_gizmo.draw_settings_with_index(context, layout, 3)
         return dict(
             text="Scale",
             # cursor='SCROLL_XY',
@@ -231,15 +250,19 @@ class _defs_transform:
             widget="TRANSFORM_GGT_gizmo",
             operator="transform.resize",
             keymap="3D View Tool: Scale",
+            draw_settings=draw_settings,
         )
 
     @ToolDef.from_fn
     def scale_cage():
+        def draw_settings(context, layout, tool):
+            _template_widget.TRANSFORM_GGT_gizmo.draw_settings_with_index(context, layout, 3)
         return dict(
             text="Scale Cage",
             icon="ops.transform.resize.cage",
             widget="VIEW3D_GGT_xform_cage",
             operator="transform.resize",
+            draw_settings=draw_settings,
         )
 
     @ToolDef.from_fn
@@ -252,6 +275,8 @@ class _defs_transform:
             props = tool.gizmo_group_properties("TRANSFORM_GGT_gizmo")
             layout.prop(props, "drag_action")
 
+            _template_widget.TRANSFORM_GGT_gizmo.draw_settings_with_index(context, layout, 1)
+
         return dict(
             text="Transform",
             description=(