Fix [#33424] Inadequate bake action.

bake_action tries to make kind of a 'visual keying'... On one side, this is rather stupid when you keep constraints (in this case, keying actual loc/rot/scale transforms, i.e. matrix_basis, is enough, doing more would lead to unexpected behavior with some constraints). On the other one, making a good visual keying of bones is *really* tricky, so now using the new object's convert_space() func to compute that (when the user chooses to remove the constraints).

Incidentally, this greatly simplifies the code of bake_action!

release/scripts/startup/bl_operators/anim.py

@@ -187,17 +187,20 @@ class BakeAction(Operator):
             )
     only_selected = BoolProperty(
             name="Only Selected",
+            description="Only key selected object/bones",
             default=True,
             )
     clear_constraints = BoolProperty(
             name="Clear Constraints",
+            description="Remove all constraints from keyed object/bones, and do 'visual' keying",
             default=False,
             )
     bake_types = EnumProperty(
             name="Bake Data",
+            description="Which data's transformations to bake",
             options={'ENUM_FLAG'},
-            items=(('POSE', "Pose", ""),
-                   ('OBJECT', "Object", ""),
+            items=(('POSE', "Pose", "Bake bones transformations"),
+                   ('OBJECT', "Object", "Bake object transformations"),
                    ),
             default={'POSE'},
             )
@@ -208,12 +211,12 @@ class BakeAction(Operator):
 
         action = anim_utils.bake_action(self.frame_start,
                                         self.frame_end,
-                                        self.step,
-                                        self.only_selected,
-                                        'POSE' in self.bake_types,
-                                        'OBJECT' in self.bake_types,
-                                        self.clear_constraints,
-                                        True,
+                                        frame_step=self.step,
+                                        only_selected=self.only_selected,
+                                        do_pose='POSE' in self.bake_types,
+                                        do_object='OBJECT' in self.bake_types,
+                                        do_constraint_clear=self.clear_constraints,
+                                        do_clean=True,
                                         )
 
         if action is None: