(POP_FAILURE_REG_OR_COUNT): Renamed from POP_FAILURE_REG.
Handle popping of a register's or a counter's data.
(POP_FAILURE_POINT): Use the new name.
(re_match_2_internal): Push counter data on the stack for succeed_n,
jump_n and set_number_at and remove misleading dead code in succeed_n.
frames, update the display for each frame as soon as possible,
instead of first building all desired matrices for all frames, and
then updating them all.
(try_cursor_movement): Handle case that last_cursor.vpos is -1.
(kbd_buffer_events_waiting): Slightly rewritten.
(clear_event): New function.
(kbd_buffer_get_event): Use it, and clear the input_events of
HELP_EVENTs.
(init_keyboard): Remove duplicate creation of kbd_buffer_gcpro and
don't fill the newly created array with nils.
(toplevel): Convert some old-style function forward declarations
to prototypes.
(save_restriction_restore): Rewrite to understand new form of data
saved by save_restriction_save.
(Fsave_restriction): Remove cautionary note in doc-string.
to put text into clipboard, return 1, as Fw16_set_clipboard_data
expects. In case of other failures, return 3.
(system_error_msg): New error message.
(Fw16_set_clipboard_data): If set_clipboard_data returns 3, print
system_error_msg.
off other appearances in case TS_exit_attribute_mode is not equal
to TS_end_standout_mode.
(insert_glyphs): Turn inverse video on/off for each run of glyphs
with the same face.
(turn_off_face): Reset standout_mode only if
TS_exit_attribute_mode has been output and TS_exit_attribute_mode
is equal to TS_end_standout_mode.
(TRACE_MOVE) [GLYPH_DEBUG]: New macro.
(move_it_in_display_line_to): Record iterator's ascent and descent
before producing glyphs, and restore them when we know the glyph
doesn't fit on the line.
(move_it_to): Restructured so that it's easier to debug. If
moving to a vpos, and not moving to an x or character position,
stop as soon as the specified vpos is reached; don't move further
into that line because that might change the computed line height.
(try_cursor_movement): New function, extracted from the cursor
movement branch of redisplay_window. If ending on a partially
visible line, don't try to scroll if the cursor line is taller
than the window.
(redisplay_window): Use try_cursor_movement.
