implement and integrate multiple overlay arrows with redisplay.
(syms_of_xdisp): DEFVAR_LISP and initialize it.
(last_arrow_position, last_arrow_string): Replace by properties.
(Qlast_arrow_position, Qlast_arrow_string)
(Qoverlay_arrow_string, Qoverlay_arrow_bitmap): New variables.
(syms_of_xdisp): Intern and staticpro them.
(overlay_arrow_string_or_property, update_overlay_arrows)
(overlay_arrow_in_current_buffer_p, overlay_arrows_changed_p)
(overlay_arrow_at_row): New functions for multiple overlay arrows.
(redisplay_internal): Use them instead of directly accessing
Voverlay_arrow_position etc. for multiple overlay arrows.
(mark_window_display_accurate): Use update_overlay_arrows.
(try_cursor_movement): Use overlay_arrow_in_current_buffer_p.
(try_window_id): Use overlay_arrows_changed_p.
(get_overlay_arrow_glyph_row): Add overlay_arrow_string arg.
(display_line): Use overlay_arrow_at_row to check multiple
overlay arrows, and get relevant overlay-arrow-string and
overlay-arrow-bitmap. Set w->overlay_arrow_bitmap accordingly.
(produce_image_glyph): Set pixel_width = 0 for fringe bitmap.
(syms_of_xdisp): Remove last_arrow_position and last_arrow_string.
* xterm.c (x_calc_absolute_position): Call x_real_positions
to get WM window sizes and use those to calculate position.
(x_set_offset): Removed code commented out.
numchars arg. Always store event into bufp arg. Return nothing.
Callers changed accordingly.
(glyph_rect): Simplify.
(STORE_KEYSYM_FOR_DEBUG): New macro.
(SET_SAVED_MENU_EVENT): Use inev instead of bufp, etc.
(current_bufp, current_numcharsp) [USE_GTK]: Remove.
(current_hold_quit) [USE_GTK]: Add.
(event_handler_gdk): Adapt to new handle_one_xevent.
(handle_one_xevent): Remove bufp_r and numcharsp args.
Add hold_quit arg. Rework to use just one, local, inev
input_event. Store inev directly in fifo using
kbd_buffer_store_event_hold. Update count in one place.
Postpone call to gen_help_event until inev is stored; use new
local do_help for this.
Simplify handling of keysyms (consolidate common code). Fix bug
where count was updated with nchars instead of nbytes.
Remove local emacs_event in handing of ButtonPress event; just use
inev instead (so no reason to copy it later).
Remove `out' label. Rename label `ret' to `done'; add various
`goto done' to clarify code flow in deeply nested blocks.
(x_dispatch_event): Simplify as handle_one_xevent now calls
kbd_buffer_store_event itself.
(XTread_socket): Remove bufp_r and numcharsp args. Add hold_quit
arg. Call handle_one_xevent with new arglist. Store event from
x_session_check_input in fifo.
[USE_GTK]: Setup current_hold_quit.
Decrement handling_signal before unblocking input.
(x_initialize) [USE_GTK]: Initialize current_count.
Add hold_quit arg. Rework to use just one, local, inev
input_event. Store inev directly in fifo using
kbd_buffer_store_event_hold. Update count in one place.
Postpone call to gen_help_event until inev is stored; use new
local do_help for this.
Remove local emacs_event in handing of ButtonPress event; just use
inev instead (so no reason to copy it later).
(read_input_waiting): Adapt to new read_socket_hook interface.
Remove allocation and initialization of local input_event buffer,
as read_socket_hook stores events directly in fifo. Allocate and
initialize local hold_quit event to handle postponed quit event
(and store it if set by kbd_buffer_store_event_hold).
an event into kbd fifo, but with special handling of quit event;
a quit event is saved for later, and further events are discarded
until the saved quit event has been processed.
(kbd_buffer_store_event): Use kbd_buffer_store_event_hold.
(gen_help_event): Store help event in kbd fifo.
(NREAD_INPUT_EVENTS): Remove.
(read_avail_input): Adapt to new read_socket_hook interface.
Remove allocation and initialization of local input_event buffer,
as read_socket_hook stores events directly in fifo. Allocate and
initialize local hold_quit event to handle postponed quit event
(and store it if set by kbd_buffer_store_event_hold).
right-fringe similar to a display margin image. Specifically,
the characters having the fringe prop are no longer shown, and
we use IT_IMAGE/next_element_from_image with image_id = -1 to
do this. Set fringe bitmap face_id in it->face_id.
(produce_image_glyph): Handle image_id < 0 as "no image" case, but
still realize it->face (i.e. the fringe bitmap face).
