fix `select-list-get-selection' and avoid copying the list in `elements'

scheme/select-list.scm

@@ -31,9 +31,7 @@
 		  (num-lines ,(select-list-num-lines r)))))
 
 (define (make-select-list elements num-lines)
-  (if (and (proper-list? elements) (every element? elements))
-      (really-make-select-list elements 0 0 num-lines)
-      (error "wrong argument type" elements)))
+  (really-make-select-list elements 0 0 num-lines))
 
 (define key-m 109)
 
@@ -102,17 +100,6 @@
      (else
       (values (index-move cursor-index) view-index)))))
 
-(define (copy-element-list elements)
-  (fold-right
-   (lambda (el result)
-     (cons 
-      (make-element (element-markable? el)
-		    (element-marked? el)
-		    (element-value el)
-		    (element-text el))
-      result))
-   '() elements))
-
 (define (move-cursor-maker index-move)
   (lambda (select-list)
     (let* ((elements (select-list-elements select-list))
@@ -127,7 +114,7 @@
 			    num-lines))
       (lambda (cursor-index view-index)
 	(really-make-select-list
-	 (copy-element-list elements)
+	 elements
 	 view-index
 	 cursor-index 
 	 num-lines))))))
@@ -177,8 +164,8 @@
 
 (define (select-list-get-selection select-list)
   (map element-value
-       (filter-map element-marked? 
-		   (select-list-elements select-list))))
+       (filter element-marked? 
+	       (select-list-elements select-list))))
 
 (define (select-list-selected-entry select-list)
   (element-value