bugfix: avoid losing attributes on boxes which have a single children

this used to cause impossibility of selecting a let .. in term

diff --git a/helm/ocaml/cic_notation/cicNotationPres.ml b/helm/ocaml/cic_notation/cicNotationPres.ml
index 8d548e1ebf641c72b034589aead5edb8bd485a1a..60ee0dfb382f747c44c571e22030aec0fbd2c4d7 100644 (file)
--- a/helm/ocaml/cic_notation/cicNotationPres.ml
+++ b/helm/ocaml/cic_notation/cicNotationPres.ml
@@ -35,13 +35,6 @@ let atop_attributes = [None, "linethickness", "0pt"]
 
 let to_unicode = Utf8Macro.unicode_of_tex
 
-(* let rec make_attributes l1 = function
-  | [] -> []
-  | None :: tl -> make_attributes (List.tl l1) tl
-  | Some s :: tl ->
-      let p,n = List.hd l1 in
-      prerr_endline (Printf.sprintf "make_attributes %s %s" n s);
-      (p,n,s) :: make_attributes (List.tl l1) tl *)
 let rec make_attributes l1 = function
   | [] -> []
   | hd :: tl ->
@@ -49,18 +42,21 @@ let rec make_attributes l1 = function
       | None -> make_attributes (List.tl l1) tl
       | Some s ->
           let p,n = List.hd l1 in
-(*           prerr_endline (Printf.sprintf "make_attributes %s %s" n s); *)
           hd := None;
           (p,n,s) :: make_attributes (List.tl l1) tl)
 
 let box_of_mpres =
   function
-    Mpresentation.Mobject (_, box) -> box
+  | Mpresentation.Mobject (attrs, box) ->
+      assert (attrs = []);
+      box
   | mpres -> Box.Object ([], mpres)
 
 let mpres_of_box =
   function
-    Box.Object (_, mpres) -> mpres
+  | Box.Object (attrs, mpres) ->
+      assert (attrs = []);
+      mpres
   | box -> Mpresentation.Mobject ([], box)
 
 let rec genuine_math =
@@ -86,9 +82,19 @@ let rec promote_to_math =
 let small_skip =
   Mpresentation.Mspace (RenderingAttrs.small_skip_attributes `MathML)
 
+let rec add_mpres_attributes new_attr = function
+  | Mpresentation.Mobject (attr, box) ->
+      Mpresentation.Mobject (attr, add_box_attributes new_attr box)
+  | mpres ->
+      Mpresentation.set_attr (new_attr @ Mpresentation.get_attr mpres) mpres
+and add_box_attributes new_attr = function
+  | Box.Object (attr, mpres) ->
+      Box.Object (attr, add_mpres_attributes new_attr mpres)
+  | box -> Box.set_attr (new_attr @ Box.get_attr box) box
+
 let box_of mathonly spec attrs children =
   match children with
-    | [t] -> t
+    | [t] -> add_mpres_attributes attrs t
     | _ ->
        let kind, spacing, indent = spec in
        let dress children =