* frame.h (struct frame): Drop can_have_scroll_bars member

which is meaningless for a long time.  Adjust comments.
(FRAME_CAN_HAVE_SCROLL_BARS): Remove.
* frame.c, nsfns.m, term.c, w32fns.c, xfns.c: Adjust users.

src/ChangeLog

+2012-11-03  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* frame.h (struct frame): Drop can_have_scroll_bars member
+	which is meaningless for a long time.  Adjust comments.
+	(FRAME_CAN_HAVE_SCROLL_BARS): Remove.
+	* frame.c, nsfns.m, term.c, w32fns.c, xfns.c: Adjust users.
+
 2012-11-03  Dmitry Antipov  <dmantipov@yandex.ru>
 	* window.c (decode_next_window_args): Update window arg after

src/frame.c

@@ -502,7 +502,6 @@ make_initial_frame (void)
   FRAME_FOREGROUND_PIXEL (f) = FACE_TTY_DEFAULT_FG_COLOR;
   FRAME_BACKGROUND_PIXEL (f) = FACE_TTY_DEFAULT_BG_COLOR;
 
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 0;
   FRAME_VERTICAL_SCROLL_BAR_TYPE (f) = vertical_scroll_bar_none;
 
   /* The default value of menu-bar-mode is t.  */
@@ -551,7 +550,6 @@ make_terminal_frame (struct terminal *terminal)
   FRAME_BACKGROUND_PIXEL (f) = FACE_TTY_DEFAULT_BG_COLOR;
 #endif /* not MSDOS */
 
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 0;
   FRAME_VERTICAL_SCROLL_BAR_TYPE (f) = vertical_scroll_bar_none;
   FRAME_MENU_BAR_LINES(f) = NILP (Vmenu_bar_mode) ? 0 : 1;
 

src/frame.h

@@ -409,10 +409,6 @@ struct frame
      show no modeline for that window.  */
   unsigned wants_modeline : 1;
 
-  /* Non-zero if the hardware device this frame is displaying on can
-     support scroll bars.  */
-  char can_have_scroll_bars;
-
   /* Non-0 means raise this frame to the top of the heap when selected.  */
   unsigned auto_raise : 1;
 
@@ -438,8 +434,7 @@ struct frame
   /* Nonzero means that the pointer is invisible. */
   unsigned pointer_invisible :1;
 
-  /* If can_have_scroll_bars is non-zero, this is non-zero if we should
-     actually display them on this frame.  */
+  /* Nonzero if we should actually display the scroll bars on this frame.  */
   enum vertical_scroll_bar_type vertical_scroll_bar_type;
 
   /* What kind of text cursor should we draw in the future?
@@ -767,11 +762,6 @@ typedef struct frame *FRAME_PTR;
 #define FRAME_SCROLL_BOTTOM_VPOS(f) (f)->scroll_bottom_vpos
 #define FRAME_FOCUS_FRAME(f) f->focus_frame
 
-/* Nonzero if frame F supports scroll bars.
-   If this is zero, then it is impossible to enable scroll bars
-   on frame F.  */
-#define FRAME_CAN_HAVE_SCROLL_BARS(f) ((f)->can_have_scroll_bars)
-
 /* This frame slot says whether scroll bars are currently enabled for frame F,
    and which side they are on.  */
 #define FRAME_VERTICAL_SCROLL_BAR_TYPE(f) ((f)->vertical_scroll_bar_type)

src/nsfns.m

@@ -1175,7 +1175,6 @@ Turn the input menu (an NSMenu) into a lisp list for tracking on lisp side
       f = make_frame (1);
 
   XSETFRAME (frame, f);
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 1;
 
   f->terminal = dpyinfo->terminal;
 

src/term.c

@@ -3235,7 +3235,6 @@ use the Bourne shell command `TERM=... export TERM' (C-shell:\n\
     FrameCols (tty) = FRAME_COLS (f);
     tty->specified_window = FRAME_LINES (f);
 
-    FRAME_CAN_HAVE_SCROLL_BARS (f) = 0;
     FRAME_VERTICAL_SCROLL_BAR_TYPE (f) = vertical_scroll_bar_none;
     terminal->char_ins_del_ok = 1;
     baud_rate = 19200;

src/w32fns.c

@@ -4284,9 +4284,6 @@ This function is an internal primitive--use `make-frame' instead.  */)
 
   XSETFRAME (frame, f);
 
-  /* Note that Windows does support scroll bars.  */
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 1;
-
   /* By default, make scrollbars the system standard width. */
   FRAME_CONFIG_SCROLL_BAR_WIDTH (f) = GetSystemMetrics (SM_CXVSCROLL);
 
@@ -5387,7 +5384,6 @@ x_create_tip_frame (struct w32_display_info *dpyinfo,
   Finsert (1, &text);
   set_buffer_internal_1 (old_buffer);
 
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 0;
   record_unwind_protect (unwind_create_tip_frame, frame);
 
   /* By setting the output method, we're essentially saying that

src/xfns.c

@@ -3111,9 +3111,6 @@ This function is an internal primitive--use `make-frame' instead.  */)
 
   XSETFRAME (frame, f);
 
-  /* Note that X Windows does support scroll bars.  */
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 1;
-
   f->terminal = dpyinfo->terminal;
 
   f->output_method = output_x_window;
@@ -4596,7 +4593,6 @@ x_create_tip_frame (struct x_display_info *dpyinfo,
   Finsert (1, &text);
   set_buffer_internal_1 (old_buffer);
 
-  FRAME_CAN_HAVE_SCROLL_BARS (f) = 0;
   record_unwind_protect (unwind_create_tip_frame, frame);
 
   f->terminal = dpyinfo->terminal;