f89ff62367 Extend Tramp external operations
4dea6ea36b markdown-ts-mode: fix duplicated menu entries (bug#81201)
9cad2da66e ; Fix last change.
cd84bd6a0c vc-dir-recompute-file-state: Change directory to DEF-DIR
47bdbc8d85 Restore "interactive" when describing functions
1a5d9a4be3 Inhibit follow-link via `mouse-1' on the tab-bar (bug#81036)
c94d58ddbf Fix the tab close button appearance when clicking (bug#76...
a21614d4d6 ; Skip one vc-dir test on MS-Windows
abddd2075a ; Fix last change to vc-dir-recompute-file-state.
89bda8736a Install images with info documentation (bug#81204)
466789b511 vc-dir-recompute-file-state: Return nil state for nonexis...
* src/xdisp.c (handle_tab_bar_click): Use the variable 'close_p'
to show mouse face as sunken/raised only when clicked
on the close button. Clicking elsewhere on the tab should not
change the close button's appearance using DRAW_MOUSE_FACE.
* src/xfaces.c (Finternal_lisp_face_equal_p): Accept an additional
optional argument INHERIT; if non-nil, consider two faces equal if
one inherits from the other and doesn't specify any other
attributes to be different from it.
* src/xdisp.c (try_cursor_movement, try_window_id): Call
'Finternal_lisp_face_equal_p' with non-nil INHERIT argument, to
speed up redisplay in the default case when line numbers are shown.
(Bug#81133)
* test/src/xfaces-tests.el (xfaces-test-face-equality): New test.
C2y will standardize countof as the macro that Emacs uses the name
ARRAYELTS for. Switch to the standard name, which is supported
by GCC 16+, by Clang 21, and by the Gnulib stdcountof-h module already
in use for compilers that do not support countof.
Also, use countof in a few places where we missed using ARRAYELTS.
* admin/coccinelle/arrayelts.cocci: Suggest countof, not ARRAYELTS.
* admin/merge-gnulib (GNULIB_MODULES): Add stdcountof-h,
as it is now a direct rather than an indirect dependency.
* exec/trace.c, src/lisp.h, src/sfnt.c: Include <stdcountof.h>.
(ARRAYELTS): Remove. All uses replaced by countof.
* lib-src/ebrowse.c, lib-src/etags.c, lib-src/make-docfile.c:
* lib-src/seccomp-filter.c, lwlib/lwlib-Xaw.c:
Prefer <stdcountof.h> and countof to doing things by hand.
GCC 16’s -Wuseless-cast warning can be useful.
Fix the useless casts it identifies, and also fix false positives
by using compound literals, which are safer anyway than casts.
* src/composite.c (composition_adjust_point)
(Ffind_composition_internal):
* lwlib/xlwmenu.c (xlwMenuResources, xlwMenuClassRec)
(resource_widget_value, XlwMenuDestroy, Select):
* src/alloc.c (process_mark_stack):
* src/data.c (Faref):
* src/emacs-module.c (module_extract_big_integer):
* src/fileio.c (Finsert_file_contents):
* src/frame.h (FRAME_MESSAGE_BUF_SIZE):
* src/gtkutil.c (xg_tool_item_stale_p, update_frame_tool_bar):
* src/image.c (pbm_load, png_load_body, jpeg_load_body)
(tiff_load, gif_load):
* src/pdumper.c (ptrdiff_t_to_dump_off, dump_queue_dequeue)
(field_relpos, dump_field_emacs_ptr)
(dump_object_start_pseudovector, pdumper_remember_scalar_impl)
(pdumper_load, syms_of_pdumper):
* src/regex-emacs.c (BUF_PUSH, BUF_PUSH_2, POINTER_TO_OFFSET):
* src/xdisp.c (remember_mouse_glyph, pint2str):
* src/xterm.c (cvt_string_to_pixel, handle_one_xevent):
Omit useless casts. Perhaps they were formerly needed,
but they should not be needed now.
* src/alloc.c (Fmemory_info):
* src/category.c (Fdefine_category, Fmodify_category_entry):
* src/data.c (Fash):
* src/dispextern.h (GLYPH_CODE_P):
* src/emacs.c (load_seccomp):
* src/fns.c (Flocale_info, maybe_resize_hash_table):
* src/indent.c (check_display_width):
* src/json.c (symset_size):
* src/lisp.h (XUNTAG, BOOL_VECTOR_LENGTH_MAX, obarray_size)
(hash_table_index_size):
* src/lread.c (make_obarray, grow_obarray, Fobarray_clear):
* src/menu.c (digest_single_submenu, x_popup_menu_1):
* src/term.c (init_tty):
* src/widget.c (update_wm_hints):
* src/xdisp.c (truncate_echo_area):
* src/xfns.c (x_set_border_pixel):
* src/xfont.c (xfont_match, xfont_open):
* src/xmenu.c (set_frame_menubar):
* test/src/emacs-module-resources/mod-test.c (emacs_module_init):
Use compound literal instead of a cast that is useless in
some platforms but not others.
* src/dispextern.h, src/haikugui.h, src/w32gui.h:
(WINDOW_HANDLE_UINTPTR): New macro.
* src/frame.c (gui_report_frame_params):
* src/xterm.c (x_try_cr_xlib_drawable):
Use it.
* src/lisp.h (XUNTAG): And tag with UINTPTR_MAX to pacify
gcc warning about a constant out of range.
(hash_idx_t): Make it int_least32_t, as it need not be exactly 32 bits.
(PRIdHASH_IDX): New macro.
* src/pdumper.c (dump_queue_dequeue): Use it.
* src/profiler.c (setup_cpu_timer): Make a local EMACS_INT
rather than int, to avoid need for casting later.
* src/syntax.c (uninitialized_interval):
Use 1u rather than 1 so the cast is always useful.
A compound literal wouldn’t do here, as this macro
needs to be an integer constant expression.
* src/xfns.c (XICCallback, XICProc): Remove macros.
(Xxic_preedit_start_callback): Use a cleaner way to specify it,
avoiding the need for type macros, and for a cast
if HAVE_XICCALLBACK_CALLBACK.
* src/xterm.c (handle_one_xevent): 2nd arg is now XEvent *
on all platforms, as there is no need to diverge, and
diverging meant we needed lots of unnecessary casts.
* src/xdisp.c (display_line): Remove the unnecessary condition that
row->used of the margin areas is zero, for when we call
'extend_face_to_end_of_line'. (Bug#80693)
A new basic face 'margin' is used for text displayed in the left and
right margin areas, i.e., the areas typically used by VCS and LSP
packages for per-line annotations. Its background defaults to the
frame default, preserving existing behavior for users who do not
customize it.
* etc/NEWS: Document the new 'margin' face.
* lisp/faces.el (margin): Add 'margin' face, inheriting from 'default'.
* src/dispextern.h (face_id): Add MARGIN_FACE_ID.
* src/xdisp.c (face_at_pos): Use 'margin' as the base face for
strings displayed in margin areas so that they inherit the gutter
background by default.
(extend_face_to_end_of_line): Compute 'margin_fill_face_id' from the
'margin' face. Use while loops to explicitly fill all empty character
slots in both left and right margins for both GUI and TTY branches.
(display_line): Call 'extend_face_to_end_of_line' for beyond-EOB rows
when the window has margins. Also extend the existing condition for
text rows with empty margins to trigger when the 'margin' face
background differs from the frame default, not only when the default
face is remapped.
* src/xfaces.c (realize_basic_faces): Realize 'margin' as a basic
face to support face-remapping and efficient lookup.
(Bug#80693)
* src/xdisp.c (clear_garbaged_frames): Re-add the call to
clear_under_internal_border, reverting that part of commit
a6a3b32208 as not essential to the fix (bug#80662).
This pertains to X11 toolkit builds. Other ports (including
PGTK) seem to have mostly atomic window updates already.
* src/xterm.c (x_set_window_size_1): Resize the Xt widget eagerly,
so the next redraw is not clipped. Update the "desired" Cairo
surface dimensions. Skip waiting for next XEvent. Do all that
for child frames only. Update old comments (bug#80662).
(x_set_window_size_and_position_1): Same. Also clear the widget's
cached position coordinates (we don't keep them up to date).
(x_set_window_size, x_set_window_size_and_position): Skip
redrawing the border on child frames, it will happen during
redisplay anyway.
* src/gtkutil.c (xg_frame_set_size_and_position): On child
frames, resize the GTK widget hierarchy immediately. Update the
"desired" Cairo surface dimensions. Skip waiting for events.
* src/widget.c (EmacsFrameResize):
When resize should be a no-op, exit early (minor optimization).
(EmacsFrameExpose): Redraw the border on the last Expose event.
* src/xdisp.c (clear_garbaged_frames): Don't redraw borders here.
* src/xfns.c (x_window): Undo the previous change in bit_gravity
in the no-toolkit build. StaticGravity works the best for it
thanks to no nesting in window configuration.
* src/xdisp.c (glyph_string_containing_background_width):
Although it’s not immediately obvious whether the GCC 16 warning
is valid, adding an eassume here shouldn’t hurt.
This is intended to parallel the 'mode-line-active/inactive'
and 'header-line-active/inactive' distinction.
* doc/emacs/display.texi (Standard Faces): Document the new faces.
* lisp/faces.el (tab-line-active, tab-line-inactive): Add new faces.
* lisp/tab-line.el (tab-line-faces): Add new faces
to MEMBERS arg of 'defgroup'.
(tab-line-auto-hscroll): Use one of the faces
depending on 'mode-line-window-selected-p'.
* src/dispextern.h (CURRENT_TAB_LINE_ACTIVE_FACE_ID_3)
(CURRENT_TAB_LINE_ACTIVE_FACE_ID): New macros
based on header-line equivalents.
(CURRENT_TAB_LINE_HEIGHT): Use CURRENT_TAB_LINE_ACTIVE_FACE_ID.
(face_id): Use TAB_LINE_ACTIVE_FACE_ID and
TAB_LINE_INACTIVE_FACE_ID instead of TAB_LINE_FACE_ID.
* src/xdisp.c (window_box_height, pos_visible_p, init_iterator)
(window_text_pixel_size, display_mode_lines, display_mode_line)
(format-mode-line): Replace all uses of TAB_LINE_FACE_ID with
either a new macro or the new face IDs.
* src/xfaces.c (lookup_basic_face, realize_basic_faces):
Map new face IDs to their lisp symbols.
(syms_of_xfaces): New lisp symbols.
* src/xdisp.c (display_line): Under WORD_WRAP, save and restore
the iterator _before_ the wrap point. This fixes face extension
under 'visual-line-mode', because otherwise 'extend_face_to_end_of_line'
is called with the value of 'it' that corresponds to the first display
element on the next screen line. (Bug#80673)
* src/w32console.c (DEFAULTP, SSPRINTF, w32con_write_vt_seq)
(w32con_get_cursor_coords): New functions and macros.
(w32con_write_glyphs): Hide cursor before writing to the console.
Add code for writing in virtual-terminal mode when
'w32_use_virtual_terminal' is non-zero.
(w32con_write_glyphs_with_face): Add code for writing in
virtual-terminal mode when 'w32_use_virtual_terminal' is non-zero.
(w32con_setup_virtual_terminal): New function.
(w32con_set_terminal_modes): Call it.
(turn_on_face, turn_off_face): New functions.
(initialize_w32_display): Save background and foreground, and the
current TTY.
(Fset_screen_color): Accept an additional optional argument VTP;
if non-nil, arrange for 24-bit display to use the specified
colors.
(Fget_screen_color): Accept an additional optional argument VTP;
if non-nil, return colors used by 24-bit display.
(Fw32_use_virtual_terminal, Fw32_use_virtual_terminal_p): New
functions.
* src/term.c (tty_setup_colors) [WINDOWSNT]: Set up
virtual-terminal sequences for colors.
(init_tty) [WINDOWSNT]: Set up terminfo capabilities for Windows
virtual-terminal.
* src/xdisp.c (redisplay_internal): Don't call set_tty_color_mode
for WINDOWSNT.
* lisp/term/w32console.el (w32-tty-set-base-colors)
(w32-tty-define-base-colors, w32-tty-define-8bit-colors)
(w32-tty-define-24bit-colors, w32-tty-get-pixel): New functions.
(terminal-init-w32console): Remove color setup.
(w32-tty-setup-colors): New function.
* lisp/term/tty-colors.el (tty-color-mode-alist): Add --color
modes for 256 and 24-bit color modes.
* lisp/startup.el (tty-handle-args): Fix --color handling.
* lisp/faces.el (tty-set-up-initial-frame-faces): Set up colors
for MS-Windows consoles.
* etc/NEWS:
* doc/emacs/msdos.texi (Windows Misc):
* doc/emacs/cmdargs.texi (Colors X): Document 24-bit color support
on MS-Windows.
(Bug#79298)
* src/xdisp.c (display_menu_bar): Return immediately if the
menu-bar items were not yet computed. This avoids assertion
violations when this function is called as part of creating a new
frame. (Bug#80603)
See initial discussion here:
https://lists.gnu.org/archive/html/emacs-devel/2026-02/msg00400.html
* lisp/international/characters.el (pairs): Populate
special-mirror-table.
* src/xdisp.c (produce_special_glyphs): Add two arguments. One
to identify the paragraph direction and one to identify that the
glyph is produced on the left hand side of a window. Mirror
glyph defined in the display table according to the new
special-mirror-table. Bidi mirroring always takes precedence.
(init_iterator, insert_left_trunc_glyphs, display_line)
(display_string): Call 'produce_special_glyphs' with new arguments.
(syms_of_xdisp) <special-mirror-table>: New char-table.
* etc/NEWS: Announce the change.
* src/keyboard.c (kbd_buffer_get_event): Pass the event's frame
up to the caller by means of a new 'struct frame **' argument.
(read_event_from_main_queue): Show a message in locked frames in
single-kboard mode (bug#79892).
* src/xdisp.c (log_message): Factor out of message3.
(message3): Call it.
(message3_nolog): Rename to ...
(message3_frame_nolog): ... this. New 'struct frame *' argument
which causes temporarily switching to another frame when
displaying the message.
(message3_frame, message3_nolog): New functions.
* src/lisp.h: Declare message3_frame and message3_frame_nolog.
* admin/notes/multi-tty: Remove notes on showing a message.
* src/xdisp.c (compute_display_string_pos): Pay attention to
'display' properties that come from overlays, in case the overlays
are window-specific. Call 'handle_display_prop' with the argument
OVERLAY non-nil, if the property is from an overlay.
(compute_display_string_end): Accept an additional argument, a
pointer to the window; all callers changed. Pay attention to
'display' properties that come from overlays, in case the overlays
are window-specific. In particular, if the property comes from an
overlay, use that overlay's end position as the next place where
the 'display' property changes, effectively disregarding any
properties on buffer text that is replaced by this overlay's
'display' property.
(handle_single_display_spec): Always use the end position of the
overlay which determined the 'display' property as the end of the
property, to make sure we obey windows-specific overlays.
* src/bidi.c (bidi_fetch_char): Adapt to the above change.
* src/dispextern.h: Adjust prototype of 'compute_display_string_end'.
(Bug#80255)
* src/xdisp.c (move_it_vertically_backward): Zero out cached value
of line height, to avoid using stale and incorrect values.
(try_window_reusing_current_matrix): Fix conditions for changes in
tab-line height.
Reported by Michael Heerdegen <michael_heerdegen@mailbox.org> in
https://lists.gnu.org/archive/html/help-gnu-emacs/2026-01/msg00163.html
This improves the scrolling a little bit, but doesn't solve the
problem entirely.
* etc/NEWS: Announce the change.
* src/dispextern.h (struct glyph_row): Add
'extra_line_spacing_above' member.
(struct it): Add 'extra_line_spacing_above' member.
* src/frame.h (struct frame): Add 'extra_line_spacing_above'
member. Update comment for 'extra_line_spacing.'
* src/buffer.c (syms_of_buffer): Update the docstring of
'line-spacing' to describe the cons cell usage.
* src/buffer.h (struct buffer): Update comment for
'extra_line_spacing'.
* src/frame.c (gui_set_line_spacing): Handle cons cell value for
'line-spacing'. Calculate and set 'extra_line_spacing_above'
for both integer and float pairs.
* src/xdisp.c (init_iterator): Initialize 'extra_line_spacing_above'
from buffer or frame 'line-spacing', handling cons cells for both
integer and float values.
(gui_produce_glyphs): Use 'extra_line_spacing_above' to distribute
spacing between ascent and descent. Update 'max_extra_line_spacing'
calculation.
(resize_mini_window): Take line spacing into account when resizing the
mini window. Pass height of a single line to 'grow_mini_window' and
'shrink_mini_window'.
* src/window.c (grow_mini_window, shrink_mini_window): Add unit
argument which defines height of a single line.
* src/window.h (grow_mini_window, shrink_mini_window): Adjust function
prototypes accordingly with unit argument.
* lisp/subr.el (total-line-spacing): New function to calculate total
spacing from a number or cons cell.
(posn-col-row): Use total-line-spacing.
* lisp/simple.el (default-line-height): Use 'total-line-spacing'.
* lisp/textmodes/picture.el (picture-mouse-set-point): Use
'total-line-spacing'.
* lisp/window.el (window-default-line-height): Use
'total-line-spacing'.
(window--resize-mini-window): Take 'line-spacing' into account.
* test/lisp/subr-tests.el (total-line-spacing): New test.
* test/src/buffer-tests.el (test-line-spacing): New test.
* doc/emacs/display.texi (Display Custom): Document that
'line-spacing' can be a cons cell.
(Line Height): Document the new cons cell format for 'line-spacing'
to allow vertical centering.
Co-authored-by: Przemysław Alexander Kamiński <alexander@kaminski.se>
Co-authored-by: Daniel Mendler <mail@daniel-mendler.de>
* src/xdisp.c (redisplay_window): Don't call resize_mini_window
when the minibuffer is active and minibuffer-only frames shall
be resized automatically since that can loop infinitely (Bug#80017).
Some of the fixes are to continue to use American
rather than British spelling.
* doc/misc/modus-themes.org (my-modus-themes-engraved-faces):
Fix misspelled ‘:foreground’s.
* etc/themes/modus-themes.el (modus-themes-faces):
Fix misspelled ‘modus-themes-bold’.
* lisp/emacs-lisp/rx.el (rx--normalize-char-pattern):
Rename from rx--normalise-char-pattern.
(rx--optimize-or-args): Rename from rx--optimise-or-args.
* lisp/frame.el (frame--special-parameters):
Fix misspelled "right-divider-width".
* lisp/net/tramp.el (tramp-fingerprint-prompt-regexp):
Use American spelling “centered”, to match current libfprintf.
* lisp/org/org-fold-core.el (org-fold-core--optimize-for-huge-buffers):
Rename from org-fold-core--optimise-for-huge-buffers.
(org-fold-core-update-optimization):
Rename from org-fold-core-update-optimisation,
leaving an alias behind.
(org-fold-core-remove-optimization):
Rename from org-fold-core-remove-optimisation,
leaving an alias behind.
* lisp/org/org.el (org-advertized-archive-subtree):
This alias is now obsolete.
* lisp/play/zone.el (zone-ignored-buffers):
Fix misspelling of ‘zone--buffer-encrypted-p’.
* lisp/progmodes/csharp-mode.el (csharp-ts-mode-faces):
Fix misspelling of ‘csharp’ group.
* lisp/vc/vc.el (vc-clonable-backends-custom-type):
Rename from vc-cloneable-backends-custom-type,
leaving an alias behind.
* test/lisp/emacs-lisp/bytecomp-tests.el:
(bytecomp-tests--warn-arity-non-compiled-callee):
Rename from bytecomp-tests--warn-arity-noncompiled-callee.
(bytecomp-test-defface-spec): Reword a deliberate misspelling
of “default” that is so common I don’t want it to pollute the
spelling dictionary.
* test/lisp/emacs-lisp/package-vc-tests.el:
(package-vc-tests-preserve-artifacts):
Rename from package-vc-tests-preserve-artifacts.
* test/lisp/eshell/em-prompt-tests.el:
(em-prompt-test/forward-backward-paragraph-1):
Reword a deliberate misspelling of “goodbye” that is so common I
don’t want it to pollute the spelling dictionary.
* src/keyboard.c (make_lispy_event): Call x_y_to_column_row when
building internal menu bar events.
* src/xdisp.c (x_y_to_column_row): Provide DX and DY parameters
to x_y_to_column_row.
Make some C symbols static if they don’t need to be extern.
Also, remove a couple of functions that were discovered to be
unused as a result of this process, and mark two extern
functions intended to be usable from GDB.
* src/buffer.c (previous_overlay_change):
* src/composite.c (composition_lisp_table):
* src/fileio.c (file_name_directory):
* src/frame.c (check_tty):
* src/insdel.c (adjust_markers_for_insert):
* src/keyboard.c (unread_switch_frame, read_char)
(requeued_events_pending_p):
* src/sysdep.c (renameat_noreplace) [!HAVE_ANDROID]:
* src/textconv.c (get_conversion_field) [!HAVE_ANDROID]:
* src/treesit.c (TREESIT_BOB_LINECOL, TREESIT_TS_POINT_1_0)
(treesit_buf_tracks_linecol_p, make_treesit_parser)
(make_treesit_node):
* src/xdisp.c (x_y_to_hpos_vpos):
* src/xfaces.c (load_color) [!MSDOS]:
* src/xfns.c (x_real_pos_and_offsets):
* src/xterm.c (x_dnd_do_unsupported_drop):
Now static. Move up if necessary.
* src/coding.c (utf8_string_p):
* src/keyboard.c (detect_input_pending_ignore_squeezables):
Remove; unused.
* src/frame.c (gui_set_alpha):
* src/textconv.c (start_batch_edit, end_batch_edit, commit_text)
(finish_composing_text, set_composing_text)
(set_composing_region, textconv_set_point_and_mark)
(delete_surrounding_text, request_point_update)
(textconv_barrier, replace_text, get_extracted_text)
(get_surrounding_text):
* src/xdisp.c (gui_union_rectangles):
* src/xterm.c (xi_frame_selected_for):
Define only if needed.
* src/treesit.c (treesit_debug_print_parser_list)
(treesit_debug_print_linecol): Declare EXTERNALLY_VISIBLE.
* src/xdisp.c (x_y_to_column_row): New function, defined
only if needed. All external callers to x_y_to_hpos_vpos changed.
* src/xdisp.c (reset_message_log_need_newline): New function.
* src/lisp.h: Add prototype of 'reset_message_log_need_newline'.
* src/print.c (print_error_message): Call
'reset_message_log_need_newline' to prevent message3 from
outputting a newline after "user-error:". (Bug#79840)
* src/xdisp.c (next_element_from_display_vector): Only switch the
iterator from unibyte to multibyte, never in the other direction,
and not if the original character came from a unibyte buffer.
(Bug#79317)
The following changes make the changes for bug#79275 less
radical, closer to their previous shape, while still fixing
that bug.
* src/xdisp.c (push_prefix_prop, get_it_property): Restore
original code that determined the object and position on it.
(get_line_prefix_it_property): Take FROM_BUFFER from the actual
object of the prefix property.
* src/xdisp.c (push_it): Reset the 'string_from_prefix_prop_p' flag.
(try_window_id): Disable this optimization if the last unchanged
at-beg row begins with a display or overlay string and there;s a
line/wrap-prefix property on the row.
(push_prefix_prop): Accept an additional argument FROM_BUFFER to
indicate that the prefix property was found on buffer text
underlying a display or overlay property, and set up the position
to pop to accordingly. Reset the 'string_from_display_prop_p' flag
of the iterator after pushing IT to set up for iterating the
prefix string.
(get_it_property): Use it->string, not it->object, as indication
that prefix property is on a string.
(get_line_prefix_it_property): Accept an additional argument:
pointer to a flag indicating that the prefix property was found on
buffer text underlying a display or overlay property. Callers
adjusted.
(handle_line_prefix): Use the FROM_BUFFER flag to correctly handle
prefix properties on buffer text at the same position as a display
string. (Bug#79275)
The redisplay code is not re-entrant. To allow running ELisp code
from within redisplay, we have some hacks (e.g. `inhibit-redisplay`)
that try to avoid the resulting breakage.
This commit adds another one of those hacks, which tries
to get closer to the core of the problem, thereby making it "safe"
to override `inhibit-redisplay`, e.g. to debug jit-lock code.
* src/dispextern.h (redisplay_counter): Declare.
* src/xdisp.c (redisplay_counter): Define.
(redisplay_internal) Increment it.
(dsafe__call): Use it, in case `inhibit-redisplay` is overridden.
* src/eval.c (call_debugger): Use it as well to refine the test
we already had.
* src/xdisp.c (try_scrolling): Don't loop when the
partially-visible cursor line is at the top of the window. This
looping are pointless, and just makes redisplay slow for no reason.
(Bug#78766)
Specifically, use the term "display specification" more consistently to
distinguish from "display property", which is the full value of the
'display' text property.
* src/xdisp.c (find_display_property): Rename PROP to SPEC.
(Fget_display_property): Rename PROP to SPEC and improve docstring.
* lisp/emacs-lisp/subr-x.el (add-display-text-property): Rename PROP to
SPEC and improve docstring.
* doc/lispref/display.texi (Display Property): Reword documentation to
more-consistently refer to display specifications.
