Support menus on text-mode terminals.

Support menus on text-mode terminals.

 src/xterm.h (xw_popup_dialog): Add prototype.
 src/xmenu.c (Fx_popup_dialog): Function moved to menu.c.
 (xmenu_show): Block input here, instead in Fx_popup_menu.
 (xw_popup_dialog): New function, with X-specific bits of popup
 dialogs.
 src/xdisp.c (deep_copy_glyph_row, display_tty_menu_item): New
 functions.
 src/window.c (Fset_window_configuration): Use run-time tests of the
 frame type instead of compile-time conditionals, when menu-bar
 lines are considered.
 src/w32term.h (w32con_hide_cursor, w32con_show_cursor)
 (w32_popup_dialog): New prototypes.
 src/w32menu.c (Fx_popup_dialog): Function deleted.
 (w32_popup_dialog): New function, with w32 specific bits of popup
 dialogs.  Block input here.
 src/w32inevt.c (w32_console_read_socket): Minor change to add
 debugging TTY events.
 src/w32fns.c (show_hourglass): If returning early because the frame
 is not a GUI frame, unblock input.
 src/w32console.c (w32con_hide_cursor, w32con_show_cursor, cursorX)
 (cursorY): New functions.
 src/termhooks.h (cursorX, cursorY): Prototypes of functions on
 WINDOWSNT, macros that call curX and curY elsewhere.
 src/termchar.h (struct tty_display_info) <showing_menu>: New flag.
 src/term.c (tty_hide_cursor, tty_show_cursor) [WINDOWSNT]: Call w32
 specific function to hide and show cursor on a text-mode terminal.
 (tty_menu_struct, struct tty_menu_state): New structures.
 (tty_menu_create, tty_menu_make_room, tty_menu_search_pane)
 (tty_menu_calc_size, mouse_get_xy, tty_menu_display)
 (have_menus_p, tty_menu_add_pane, tty_menu_add_selection)
 (tty_menu_locate, save_and_enable_current_matrix)
 (restore_desired_matrix, screen_update, read_menu_input)
 (tty_menu_activate, tty_menu_destroy, tty_menu_help_callback)
 (tty_pop_down_menu, tty_menu_last_menubar_item)
 (tty_menu_new_item_coords, tty_menu_show): New functions.
 (syms_of_term): New DEFSYMs for tty-menu-* symbols.
 src/nsterm.h (ns_popup_dialog): Adjust prototype.
 src/nsmenu.m (ns_menu_show): Block and unblock input here, instead
 of in x-popup-menu.
 (ns_popup_dialog): Adapt order of arguments to the other
 *_menu_show implementations.
 (Fx_popup_dialog): Function deleted.
 src/msdos.c (x_set_menu_bar_lines): Delete unused function.
 src/menu.h (tty_menu_show, menu_item_width): provide prototypes.
 src/menu.c (have_boxes): New function.
 (single_keymap_panes): Use it instead of a compile-time
 conditional.
 (single_menu_item): Use run-time tests of the frame type instead
 of compile-time conditionals.
 (encode_menu_string): New function.
 (list_of_items, list_of_panes): Use it instead of ENCODE_STRING
 the macro, since different types of frame need different encoding
 of menu items.
 (digest_single_submenu): Use run-time tests of frame type instead
 of, or in addition to, compile-time conditionals.
 (menu_item_width, Fmenu_bar_menu_at_x_y): New functions.
 (Fx_popup_menu): Detect when the function is called from keyboard
 on a TTY.  Don't barf when invoked on a text-mode frame.  Check
 frame type at run time, instead of compile-time conditionals for
 invoking terminal-specific menu-show functions.  Call
 tty_menu_show on text-mode frames.
 (Fx_popup_dialog): Moved here from xmenu.c.  Test frame types at
 run time to determine which alternative to invoke; support dialogs
 on TTYs.
 src/keyboard.h <Qmouse_movement>: Declare.
 src/keyboard.c <Qmouse_movement>: Now extern.
 <Qecho_keystrokes>: New static variable.
 (read_key_sequence): Accept an additional argument, a flag to
 prevent redisplay during reading of the key sequence.  All callers
 changed.
 (read_menu_command): New function.
 (read_char): When COMMANDFLAG is -2, do not redisplay and do not
 autosave.
 (toolkit_menubar_in_use): New function.
 (make_lispy_event): Use it instead of a compile-time test.
 src/fns.c (Fyes_or_no_p) [HAVE_MENUS]: Don't condition on
 window-system being available.
 src/editfns.c (Fmessage_box) [HAVE_MENUS]: Don't condition the call
 to x-popup-dialog on the frame type, they all now support popup
 dialogs.
 src/dispnew.c (save_current_matrix): Save the margin areas.
 (restore_current_matrix): Restore margin areas.
 (update_frame_with_menu): New function.
 src/dispextern.h (display_tty_menu_item, update_frame_with_menu):
 Add prototypes.
 src/alloc.c (make_save_ptr): Now compiled unconditionally.

 lisp/tmm.el (tmm-menubar): Adapt doc string to TTY menus
 functionality.
 lisp/tooltip.el (tooltip-mode): Don't error out on TTYs.
 lisp/menu-bar.el (popup-menu, popup-menu-normalize-position): Moved
 here from mouse.el.
 (popup-menu): Support menu-bar navigation on TTYs using C-f/C-b
 and arrow keys.
 (tty-menu-navigation-map): New map for TTY menu navigation.
 lisp/loadup.el ("tooltip"): Load even if x-show-tip is not available.
 lisp/frame.el (display-mouse-p): Report text-mode mouse as available
 on w32.
 (display-popup-menus-p): Report availability if mouse is
 available; don't condition on window-system.
 lisp/faces.el (tty-menu-enabled-face, tty-menu-disabled-face)
 (tty-menu-selected-face): New faces.

 configure.ac (HAVE_MENUS): Define unconditionally.

 doc/emacs/screen.texi (Menu Bar): Adapt to TTY menus.
 doc/emacs/frames.texi (Frames): Mention menu support on text terminals.
 doc/emacs/files.texi (Visiting): Mention the "File" menu-bar menu.
 doc/emacs/display.texi (Standard Faces): Mention TTY faces for menus.

 doc/lispref/keymaps.texi (Defining Menus, Mouse Menus, Menu Bar): Modify
 wording to the effect that menus are supported on TTYs.
 doc/lisprefframes.texi (Pop-Up Menus, Dialog Boxes)
 (Display Feature Testing): Update for menu support on TTYs.

  etc/NEWS: Mention the new features.