racket/gui: fix get-plain-label and docs about labels

pkgs/gui-pkgs/gui-doc/scribblings/gui/button-class.scrbl

@@ -48,8 +48,9 @@ in @racket[label] is converted to @litchar{&} (with no mnemonic
 underlining). On Mac OS X, a parenthesized mnemonic character is
 removed (along with any surrounding space) before the label is
 displayed, since a parenthesized mnemonic is often used for non-Roman
-languages. Finally, any text after a tab character is removed on all
+languages. Finally, for historical reasons, any text after a tab character is removed on all
-platforms. Mnemonic keyboard events are handled by
+platforms. All of these rules are consistent with label handling in
+menu items (see @method[labelled-menu-item<%> set-label]). Mnemonic keyboard events are handled by
 @method[top-level-window<%> on-traverse-char] (but not on Mac OS
 X).
 

pkgs/gui-pkgs/gui-doc/scribblings/gui/labelled-menu-item-intf.scrbl

@@ -47,10 +47,8 @@ See also @method[labelled-menu-item<%> set-label] and
            label-string?]{
 
 Like @method[labelled-menu-item<%> get-label], except that
-@litchar{&}s in the label are removed as described in
+@litchar{&}s and tab characters in the label are stripped in
-@method[labelled-menu-item<%> set-label].
+the same way as for @method[window<%> set-label].
-
-
 }
 
 @defmethod[(is-enabled?)
@@ -110,14 +108,17 @@ If the label contains @litchar{&} and the window is a control, the
  @litchar{&&} in the label is replaced by a literal (non-navigation)
  @litchar{&}. On Mac OS X, @litchar{&}s in the label are parsed in
  the same way as for Unix and Windows, but no mnemonic underline is
- displayed.
+ displayed. On Mac OS X, a parenthesized mnemonic character is
+ removed (along with any surrounding space) before the label is
+ displayed, since a parenthesized mnemonic is often used for non-Roman
+ languages. Finally, for historical reasons, if a label contains a tab character, then the
+ tab and all remaining characters are hidden in the displayed menu.
+ All of these rules are consistent with label handling in @racket[button%]
+ and other windows.
 
 A @litchar{&} is always preserved in the label returned by
  @method[labelled-menu-item<%> get-label], but never preserved in the
  label returned by @method[labelled-menu-item<%> get-plain-label].
 
-For historical reasons, if a label contains a tab character, then the
- tab and all remaining characters are hidden in the displayed menu.
-
 }}
 

pkgs/gui-pkgs/gui-doc/scribblings/gui/menu-class.scrbl

@@ -16,16 +16,9 @@ A @racket[menu%] object is a submenu within a @racket[menu%] or
 
 Creates a new menu with the given label.
 
-If @racket[label] contains a @litchar{&}, it is handled specially;
+If @racket[label] contains a @litchar{&} or tab characters, they are
- on Windows, the character following a @litchar{&} is underlined in
+ handled specially in the same way as for menu-item labels and buttons. See
- the displayed menu title to indicate a keyboard mnemonic.  Pressing
+ @method[labelled-menu-item<%> set-label] and @racket[button%].
- and releasing the Alt key switches to menu-selection mode in the menu
- bar where mnemonic characters are used for navigation.  An Alt
- combination might select a specific menu via @method[frame%
- on-menu-char].  A @litchar{&&} in @racket[label] is replaced by a
- literal (non-navigation) @litchar{&}ampersand. On Unix and Mac OS X,
- @litchar{&}s in the label are parsed in the same way as for Windows,
- but no mnemonic underline is displayed.
 
 If @racket[help-string] is not @racket[#f], the menu has a help
 string. See @method[labelled-menu-item<%> get-help-string] for more

pkgs/gui-pkgs/gui-doc/scribblings/gui/window-intf.scrbl

@@ -195,7 +195,25 @@ If the window does not have a label, @racket[#f] is returned.
            (or/c string? #f)]{
 
 Like
-@method[window<%> get-label], except that ampersands in the label are removed. If the window has
+@method[window<%> get-label], except that:
+
+@itemlist[
+
+ @item{If the label includes @litchar{(&}@racket[_c]@litchar{)} for
+       any character @racket[_c], then the sequenece and any surrounding
+       whitespace is removed.}
+
+ @item{If the label contains @litchar{&}@racket[_c] for any character @racket[_c],
+       the @litchar{&} is removed.}
+
+ @item{If the label contains a tab character, then the tab character and all following
+       characters are removed.}
+
+]
+
+See also @racket[button%]'s handling of labels.
+
+If the window has
  no label or the window's
  label is not a string, @racket[#f] is returned.
 

pkgs/gui-pkgs/gui-lib/mred/private/wx/common/procs.rkt

@@ -7,8 +7,8 @@
 (define/top (label->plain-label [string? s])
   (regexp-replace* #rx"&(.)" 
                    (regexp-replace 
-                    #rx"[(]&(.)[)] *"
+                    #rx" *[(]&.[)] *"
                     (regexp-replace #rx"\t.*$" s "") 
-                    "\\1")
+                    "")
                    "\\1"))
 

pkgs/gui-pkgs/gui-test/tests/gracket/windowing.rktl

@@ -170,12 +170,16 @@
 (define (label-test b l)
   (let ([&-l (format "&~a" l)]
 	[my-l (format "My ~a" l)]
-	[&-my-l (format "&My ~a" l)])
+	[&-my-l (format "&My ~a" l)]
+	[my-l-& (format "My ~a (&X) " l)])
     (st &-l b get-label)
     (st l b get-plain-label)
     (stv b set-label &-my-l)
     (st &-my-l b get-label)
     (st my-l b get-plain-label)
+    (stv b set-label my-l-&)
+    (st my-l-& b get-label)
+    (st my-l b get-plain-label)
     (stv b set-label &-l)))
 
 (let ([f (make-object frame% "Yes & No" #f 150 151 70 21)])