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Fix incompleteness in the implementation of minibuffer-follows-selected-frame

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In particular, add a new value to the variable, and fix several bugs apparent
with the implementation up till now.

* doc/emacs/mini.texi (Basic Minibuffer): Add a description of the new
non-nil, non-t value of minibuffer-follows-selected-frame.

* doc/emacs/trouble.texi (Quitting): Add a description of how C-g handles
recursive minibuffers when typed in one which isn't the most nested.

* doc/lispref/minibuf.texi (Intro to Minibuffers): Add an @dfn for "active
minibuffer".
(Minibuffer Commands): Document that exit-minibuffer throws an error when not
invoked from the innermost Minibuffer.
(Recursive Mini): Amend the description of the visibility of outer level
minibuffers.
(Minibuffer Misc): In the description of the minibuffer hooks, replace "the
minibuffer" with "a minibuffer".

* etc/NEWS (Entry announcing minibuffer-follows-selected-frame): Add a
description of the new non-nil, non-t value.

* lisp/cus-start.el (top level): make the customize entry for
minibuffer-follows-selected-frame a choice between three entries.

* lisp/minibuffer.el (exit-minibuffer): throw an error when we're not in the
most nested minibuffer.
(top level): Bind C-g to abort-minibuffers in minibuffer-local-map.

* lisp/window.el (window-deletable-p): return the symbol `frame' when (amongst
other things) minibuffer-follows-selected-frame is t.

* src/eval.c (internal_catch): Add a mechanism to (throw 'exit t) repeatedly
when the throw currently being processed doesn't terminate the current
minibuffer.

* src/lisp.h (this_minibuffer_depth): New extern declaration
(minibuf_level): extern declaration moved here from window.h.

* src/minibuf.c (minibuffer_follows_frame, minibuf_stays_put)
(minibuf_moves_frame_when_opened): New and amended functions to query the
value of minibuffer-follows-selected-frame.
(choose_minibuf_frame): check (minibuf > 1) in place of (minibufer > 0) at a
particular place.  At another place, check that an alleged frame is so and is
live.  Before selecting a non-miniwindow on a different frame, ensure it
really is a different frame.
(move_minibuffer_onto_frame): Stack up all recursive minibuffers on the target
frame.  Check the minibuf_window isn't in the old frame before setting that
frame's miniwindow to an inactive minibuffer.
(Finnermost_minibuffer_p, Fabort_minibuffers): New primitives.
(this_minibuffer_depth): New function.
(read_minibuf): Record the calling frame in a variable, and switch back to it
after the recursive edit has terminated normally, using
select-frame-set-input-focus.  Stack up all the recursive minibuffers on the
miniwindow where a new minibuffer is being opened.  After the recursive edit,
switch the selected window away from the expired minibuffer's window.
(nth_minibuffer): New function.
(minibuffer-follows-selected-frame): Change from a DEFVAR_BOOL to a
DEFVAR_LISP.

* src/window.c (decode_next_window_args): Set *minibuf to w's mini-window's
content when that content is a minibuffer.

* src/window.h (minibuf_level) Declaration moved from here to lisp.h.
This commit is contained in:
Alan Mackenzie 2021-01-10 20:32:40 +00:00
parent a583c72305
commit c7c154bb57
12 changed files with 242 additions and 48 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
doc/emacs/mini.texi
View file

@ -76,9 +76,13 @@ default, the active minibuffer moves to this new frame. If you set
the user option @code{minibuffer-follows-selected-frame} to
@code{nil}, then the minibuffer stays in the frame where you opened
it, and you must switch back to that frame in order to complete (or
abort) the current command. Note that the effect of the command, when
you finally finish using the minibuffer, always takes place in the
frame where you first opened it.
abort) the current command. If you set that option to a value which
is neither @code{nil} nor @code{t}, the minibuffer moves frame only
after a recursive minibuffer has been opened in the current command
(@pxref{Recursive Mini,,, elisp}). This option is mainly to retain
(approximately) the behavior prior to Emacs 28.1. Note that the
effect of the command, when you finally finish using the minibuffer,
always takes place in the frame where you first opened it.
@node Minibuffer File
@section Minibuffers for File Names

7
doc/emacs/trouble.texi
View file

@ -57,6 +57,13 @@ incremental search, @kbd{C-g} behaves specially; it may take two
successive @kbd{C-g} characters to get out of a search.
@xref{Incremental Search}, for details.
If you type @kbd{C-g} in a minibuffer, this quits the command that
opened that minibuffer, closing it. If that minibuffer is not the
most recently opened one (which can happen when
@code{minibuffer-follows-selected-frame} is @code{nil} (@pxref{Basic
Minibuffer})), @kbd{C-g} also closes the more recently opened ones,
quitting their associated commands, after asking you for confirmation.
On MS-DOS, the character @kbd{C-@key{Break}} serves as a quit character
like @kbd{C-g}. The reason is that it is not feasible, on MS-DOS, to
recognize @kbd{C-g} while a command is running, between interactions

24
doc/lispref/minibuf.texi
View file

@ -82,10 +82,12 @@ there is an active minibuffer; such a minibuffer is called a
incrementing the number at the end of the name. (The names begin with
a space so that they won't show up in normal buffer lists.) Of
several recursive minibuffers, the innermost (or most recently
entered) is the active minibuffer. We usually call this @emph{the}
minibuffer. You can permit or forbid recursive minibuffers by setting
the variable @code{enable-recursive-minibuffers}, or by putting
properties of that name on command symbols (@xref{Recursive Mini}.)
entered) is the @dfn{active minibuffer}--it is the one you can
terminate by typing @key{RET} (@code{exit-minibuffer}) in. We usually
call this @emph{the} minibuffer. You can permit or forbid recursive
minibuffers by setting the variable
@code{enable-recursive-minibuffers}, or by putting properties of that
name on command symbols (@xref{Recursive Mini}.)
Like other buffers, a minibuffer uses a local keymap
(@pxref{Keymaps}) to specify special key bindings. The function that
@ -2380,7 +2382,8 @@ minibuffer.
@deffn Command exit-minibuffer
This command exits the active minibuffer. It is normally bound to
keys in minibuffer local keymaps.
keys in minibuffer local keymaps. The command throws an error if the
current buffer is not the active minibuffer.
@end deffn
@deffn Command self-insert-and-exit
@ -2594,8 +2597,11 @@ returns zero.
If this variable is non-@code{nil}, you can invoke commands (such as
@code{find-file}) that use minibuffers even while the minibuffer is
active. Such invocation produces a recursive editing level for a new
minibuffer. The outer-level minibuffer is invisible while you are
editing the inner one.
minibuffer. By default, the outer-level minibuffer is invisible while
you are editing the inner one. If you have
@code{minibuffer-follows-selected-frame} set to @code{nil}, you can
have minibuffers visible on several frames at the same time.
@xref{Basic Minibuffer,,, emacs}.
If this variable is @code{nil}, you cannot invoke minibuffer commands
when the minibuffer is active, not even if you switch to another window
@ -2623,7 +2629,7 @@ active minibuffer.
@end defun
@defvar minibuffer-setup-hook
This is a normal hook that is run whenever the minibuffer is entered.
This is a normal hook that is run whenever a minibuffer is entered.
@xref{Hooks}.
@end defvar
@ -2641,7 +2647,7 @@ called once, for the outermost use of the minibuffer.
@end defmac
@defvar minibuffer-exit-hook
This is a normal hook that is run whenever the minibuffer is exited.
This is a normal hook that is run whenever a minibuffer is exited.
@xref{Hooks}.
@end defvar

13
etc/NEWS
View file

@ -102,12 +102,13 @@ effect should be negligible in the vast majority of cases anyway.
By default, when you switch to another frame, an active minibuffer now
moves to the newly selected frame. Nevertheless, the effect of what
you type in the minibuffer happens in the frame where the minibuffer
was first activated, even if it moved to another frame. An
alternative behavior is available by customizing
'minibuffer-follows-selected-frame' to nil. Here, the minibuffer
stays in the frame where you first opened it, and you must switch back
to this frame to continue or abort its command. The old, somewhat
unsystematic behavior, which mixed these two is no longer available.
was first activated. An alternative behavior is available by
customizing 'minibuffer-follows-selected-frame' to nil. Here, the
minibuffer stays in the frame where you first opened it, and you must
switch back to this frame to continue or abort its command. The old
behavior, which mixed these two, can be approximated by customizing
'minibuffer-follows-selected-frame' to a value which is neither nil
nor t.
+++
** New system for displaying documentation for groups of functions.

6
lisp/cus-start.el
View file

@ -394,7 +394,11 @@ Leaving \"Default\" unchecked is equivalent with specifying a default of
;; (directory :format "%v"))))
(load-prefer-newer lisp boolean "24.4")
;; minibuf.c
(minibuffer-follows-selected-frame minibuffer boolean "28.1")
(minibuffer-follows-selected-frame
minibuffer (choice (const :tag "Always" t)
(const :tag "When used" hybrid)
(const :tag "Never" nil))
"28.1")
(enable-recursive-minibuffers minibuffer boolean)
(history-length minibuffer
(choice (const :tag "Infinite" t) integer)

8
lisp/minibuffer.el
View file

@ -2125,8 +2125,10 @@ variables.")
;; A better solution would be to make deactivate-mark buffer-local
;; (or to turn it into a list of buffers, ...), but in the mean time,
;; this should do the trick in most cases.
(setq deactivate-mark nil)
(throw 'exit nil))
(when (innermost-minibuffer-p)
(setq deactivate-mark nil)
(throw 'exit nil))
(error "%s" "Not in most nested minibuffer"))
(defun self-insert-and-exit ()
"Terminate minibuffer input."
@ -2394,7 +2396,7 @@ The completion method is determined by `completion-at-point-functions'."
;;; Key bindings.
(let ((map minibuffer-local-map))
(define-key map "\C-g" 'abort-recursive-edit)
(define-key map "\C-g" 'abort-minibuffers)
(define-key map "\M-<" 'minibuffer-beginning-of-buffer)
(define-key map "\r" 'exit-minibuffer)

5
lisp/window.el
View file

@ -4116,7 +4116,10 @@ frame can be safely deleted."
frame))
(throw 'other t))))
(let ((minibuf (active-minibuffer-window)))
(and minibuf (eq frame (window-frame minibuf)))))
(and minibuf (eq frame (window-frame minibuf))
(not (eq (default-toplevel-value
minibuffer-follows-selected-frame)
t)))))
'frame))
((window-minibuffer-p window)
;; If WINDOW is the minibuffer window of a non-minibuffer-only

26
src/eval.c
View file

@ -1167,9 +1167,18 @@ Lisp_Object
internal_catch (Lisp_Object tag,
Lisp_Object (*func) (Lisp_Object), Lisp_Object arg)
{
/* MINIBUFFER_QUIT_LEVEL is to handle quitting from nested minibuffers by
throwing t to tag `exit'.
Value -1 means there is no (throw 'exit t) in progress;
0 means the `throw' wasn't done from an active minibuffer;
N > 0 means the `throw' was done from the minibuffer at level N. */
static EMACS_INT minibuffer_quit_level = -1;
/* This structure is made part of the chain `catchlist'. */
struct handler *c = push_handler (tag, CATCHER);
if (EQ (tag, Qexit))
minibuffer_quit_level = -1;
/* Call FUNC. */
if (! sys_setjmp (c->jmp))
{
@ -1183,6 +1192,23 @@ internal_catch (Lisp_Object tag,
Lisp_Object val = handlerlist->val;
clobbered_eassert (handlerlist == c);
handlerlist = handlerlist->next;
if (EQ (tag, Qexit) && EQ (val, Qt))
/* If we've thrown t to tag `exit' from within a minibuffer, we
exit all minibuffers more deeply nested than the current
one. */
{
EMACS_INT mini_depth = this_minibuffer_depth (Qnil);
if (mini_depth && mini_depth != minibuffer_quit_level)
{
if (minibuffer_quit_level == -1)
minibuffer_quit_level = mini_depth;
if (minibuffer_quit_level
&& (minibuf_level > minibuffer_quit_level))
Fthrow (Qexit, Qt);
}
else
minibuffer_quit_level = -1;
}
return val;
}
}

2
src/lisp.h
View file

@ -4346,6 +4346,8 @@ extern Lisp_Object Vminibuffer_list;
extern Lisp_Object last_minibuf_string;
extern void move_minibuffer_onto_frame (void);
extern bool is_minibuffer (EMACS_INT, Lisp_Object);
extern EMACS_INT this_minibuffer_depth (Lisp_Object);
extern EMACS_INT minibuf_level;
extern Lisp_Object get_minibuffer (EMACS_INT);
extern void init_minibuf_once (void);
extern void syms_of_minibuf (void);

180
src/minibuf.c
View file

@ -63,9 +63,30 @@ static Lisp_Object minibuf_prompt;
static ptrdiff_t minibuf_prompt_width;
static Lisp_Object nth_minibuffer (EMACS_INT depth);
/* Return TRUE when a frame switch causes a minibuffer on the old
frame to move onto the new one. */
static bool
minibuf_follows_frame (void)
{
return EQ (Fdefault_toplevel_value (Qminibuffer_follows_selected_frame),
Qt);
}
/* Return TRUE when a minibuffer always remains on the frame where it
was first invoked. */
static bool
minibuf_stays_put (void)
{
return NILP (Fdefault_toplevel_value (Qminibuffer_follows_selected_frame));
}
/* Return TRUE when opening a (recursive) minibuffer causes
minibuffers on other frames to move to the selected frame. */
static bool
minibuf_moves_frame_when_opened (void)
{
return !NILP (Fdefault_toplevel_value (Qminibuffer_follows_selected_frame));
}
@ -90,7 +111,7 @@ choose_minibuf_frame (void)
minibuf_window = sf->minibuffer_window;
/* If we've still got another minibuffer open, use its mini-window
instead. */
if (minibuf_level && !minibuf_follows_frame ())
if (minibuf_level > 1 && minibuf_stays_put ())
{
Lisp_Object buffer = get_minibuffer (minibuf_level);
Lisp_Object tail, frame;
@ -105,26 +126,40 @@ choose_minibuf_frame (void)
}
}
if (minibuf_follows_frame ())
if (minibuf_moves_frame_when_opened ()
&& FRAMEP (selected_frame)
&& FRAME_LIVE_P (XFRAME (selected_frame)))
/* Make sure no other frame has a minibuffer as its selected window,
because the text would not be displayed in it, and that would be
confusing. Only allow the selected frame to do this,
and that only if the minibuffer is active. */
{
Lisp_Object tail, frame;
{
Lisp_Object tail, frame;
struct frame *of;
FOR_EACH_FRAME (tail, frame)
if (MINI_WINDOW_P (XWINDOW (FRAME_SELECTED_WINDOW (XFRAME (frame))))
&& !(EQ (frame, selected_frame)
&& minibuf_level > 0))
Fset_frame_selected_window (frame, Fframe_first_window (frame),
Qnil);
}
FOR_EACH_FRAME (tail, frame)
if (!EQ (frame, selected_frame)
&& minibuf_level > 1
/* The frame's minibuffer can be on a different frame. */
&& XWINDOW ((of = XFRAME (frame))->minibuffer_window)->frame
!= selected_frame)
{
if (MINI_WINDOW_P (XWINDOW (FRAME_SELECTED_WINDOW (of))))
Fset_frame_selected_window (frame, Fframe_first_window (frame),
Qnil);
if (!EQ (XWINDOW (of->minibuffer_window)->contents,
nth_minibuffer (0)))
set_window_buffer (of->minibuffer_window,
nth_minibuffer (0), 0, 0);
}
}
}
/* If `minibuffer_follows_selected_frame' and we have a minibuffer, move it
from its current frame to the selected frame. This function is
intended to be called from `do_switch_frame' in frame.c. */
/* If `minibuffer_follows_selected_frame' is t and we have a
minibuffer, move it from its current frame to the selected frame.
This function is intended to be called from `do_switch_frame' in
frame.c. */
void move_minibuffer_onto_frame (void)
{
if (!minibuf_level)
@ -135,14 +170,18 @@ void move_minibuffer_onto_frame (void)
&& FRAME_LIVE_P (XFRAME (selected_frame))
&& !EQ (minibuf_window, XFRAME (selected_frame)->minibuffer_window))
{
EMACS_INT i;
struct frame *sf = XFRAME (selected_frame);
Lisp_Object old_frame = XWINDOW (minibuf_window)->frame;
struct frame *of = XFRAME (old_frame);
Lisp_Object buffer = XWINDOW (minibuf_window)->contents;
set_window_buffer (sf->minibuffer_window, buffer, 0, 0);
/* Stack up all the (recursively) open minibuffers on the selected
mini_window. */
for (i = 1; i <= minibuf_level; i++)
set_window_buffer (sf->minibuffer_window, nth_minibuffer (i), 0, 0);
minibuf_window = sf->minibuffer_window;
set_window_buffer (of->minibuffer_window, get_minibuffer (0), 0, 0);
if (of != sf)
set_window_buffer (of->minibuffer_window, get_minibuffer (0), 0, 0);
}
}
@ -336,6 +375,63 @@ return t only if BUFFER is an active minibuffer. */)
? Qt : Qnil;
}
DEFUN ("innermost-minibuffer-p", Finnermost_minibuffer_p,
Sinnermost_minibuffer_p, 0, 1, 0,
doc: /* Return t if BUFFER is the most nested active minibuffer.
No argument or nil as argument means use the current buffer as BUFFER. */)
(Lisp_Object buffer)
{
if (NILP (buffer))
buffer = Fcurrent_buffer ();
return EQ (buffer, (Fcar (Fnthcdr (make_fixnum (minibuf_level),
Vminibuffer_list))))
? Qt
: Qnil;
}
/* Return the nesting depth of the active minibuffer BUFFER, or 0 if
BUFFER isn't such a thing. If BUFFER is nil, this means use the current
buffer. */
EMACS_INT
this_minibuffer_depth (Lisp_Object buffer)
{
EMACS_INT i;
Lisp_Object bufs;
if (NILP (buffer))
buffer = Fcurrent_buffer ();
for (i = 1, bufs = Fcdr (Vminibuffer_list);
i <= minibuf_level;
i++, bufs = Fcdr (bufs))
if (EQ (Fcar (bufs), buffer))
return i;
return 0;
}
DEFUN ("abort-minibuffers", Fabort_minibuffers, Sabort_minibuffers, 0, 0, "",
doc: /* Abort the current minibuffer.
If we are not currently in the innermost minibuffer, prompt the user to
confirm the aborting of the current minibuffer and all contained ones. */)
(void)
{
EMACS_INT minibuf_depth = this_minibuffer_depth (Qnil);
Lisp_Object array[2];
AUTO_STRING (fmt, "Abort %s minibuffer levels? ");
if (!minibuf_depth)
error ("Not in a minibuffer");
if (minibuf_depth < minibuf_level)
{
array[0] = fmt;
array[1] = make_fixnum (minibuf_level - minibuf_depth + 1);
if (!NILP (Fyes_or_no_p (Fformat (2, array))))
Fthrow (Qexit, Qt);
}
else
Fthrow (Qexit, Qt);
return Qnil;
}
DEFUN ("minibuffer-prompt-end", Fminibuffer_prompt_end,
Sminibuffer_prompt_end, 0, 0, 0,
doc: /* Return the buffer position of the end of the minibuffer prompt.
@ -411,6 +507,7 @@ read_minibuf (Lisp_Object map, Lisp_Object initial, Lisp_Object prompt,
Lisp_Object val;
ptrdiff_t count = SPECPDL_INDEX ();
Lisp_Object mini_frame, ambient_dir, minibuffer, input_method;
Lisp_Object calling_frame = selected_frame;
Lisp_Object enable_multibyte;
EMACS_INT pos = 0;
/* String to add to the history. */
@ -648,6 +745,17 @@ read_minibuf (Lisp_Object map, Lisp_Object initial, Lisp_Object prompt,
}
}
if (minibuf_moves_frame_when_opened ())
{
EMACS_INT i;
/* Stack up all the (recursively) open minibuffers on the selected
mini_window. */
for (i = 1; i < minibuf_level; i++)
set_window_buffer (XFRAME (mini_frame)->minibuffer_window,
nth_minibuffer (i), 0, 0);
}
/* Display this minibuffer in the proper window. */
/* Use set_window_buffer instead of Fset_window_buffer (see
discussion of bug#11984, bug#12025, bug#12026). */
@ -729,6 +837,20 @@ read_minibuf (Lisp_Object map, Lisp_Object initial, Lisp_Object prompt,
recursive_edit_1 ();
/* We've exited the recursive edit without an error, so switch the
current window away from the expired minibuffer window. */
{
Lisp_Object prev = Fprevious_window (minibuf_window, Qnil, Qnil);
/* PREV can be on a different frame when we have a minibuffer only
frame, the other frame's minibuffer window is MINIBUF_WINDOW,
and its "focus window" is also MINIBUF_WINDOW. */
while (!EQ (prev, minibuf_window)
&& !EQ (selected_frame, WINDOW_FRAME (XWINDOW (prev))))
prev = Fprevious_window (prev, Qnil, Qnil);
if (!EQ (prev, minibuf_window))
Fset_frame_selected_window (selected_frame, prev, Qnil);
}
/* If cursor is on the minibuffer line,
show the user we have exited by putting it in column 0. */
if (XWINDOW (minibuf_window)->cursor.vpos >= 0
@ -767,6 +889,12 @@ read_minibuf (Lisp_Object map, Lisp_Object initial, Lisp_Object prompt,
in set-window-configuration. */
unbind_to (count, Qnil);
/* Switch the frame back to the calling frame. */
if (!EQ (selected_frame, calling_frame)
&& FRAMEP (calling_frame)
&& FRAME_LIVE_P (XFRAME (calling_frame)))
call2 (intern ("select-frame-set-input-focus"), calling_frame, Qnil);
/* Add the value to the appropriate history list, if any. This is
done after the previous buffer has been made current again, in
case the history variable is buffer-local. */
@ -790,6 +918,14 @@ is_minibuffer (EMACS_INT depth, Lisp_Object buf)
&& EQ (Fcar (tail), buf);
}
/* Return the DEPTHth minibuffer, or nil if such does not yet exist. */
static Lisp_Object
nth_minibuffer (EMACS_INT depth)
{
Lisp_Object tail = Fnthcdr (make_fixnum (depth), Vminibuffer_list);
return XCAR (tail);
}
/* Return a buffer to be used as the minibuffer at depth `depth'.
depth = 0 is the lowest allowed argument, and that is the value
used for nonrecursive minibuffer invocations. */
@ -2032,13 +2168,15 @@ For example, `eval-expression' uses this. */);
The function is called with the arguments passed to `read-buffer'. */);
Vread_buffer_function = Qnil;
DEFVAR_BOOL ("minibuffer-follows-selected-frame", minibuffer_follows_selected_frame,
doc: /* Non-nil means the active minibuffer always displays on the selected frame.
DEFVAR_LISP ("minibuffer-follows-selected-frame", minibuffer_follows_selected_frame,
doc: /* t means the active minibuffer always displays on the selected frame.
Nil means that a minibuffer will appear only in the frame which created it.
Any other value means the minibuffer will move onto another frame, but
only when the user starts using a minibuffer there.
Any buffer local or dynamic binding of this variable is ignored. Only the
default top level value is used. */);
minibuffer_follows_selected_frame = 1;
minibuffer_follows_selected_frame = Qt;
DEFVAR_BOOL ("read-buffer-completion-ignore-case",
read_buffer_completion_ignore_case,
@ -2196,6 +2334,8 @@ uses to hide passwords. */);
defsubr (&Sminibuffer_prompt);
defsubr (&Sminibufferp);
defsubr (&Sinnermost_minibuffer_p);
defsubr (&Sabort_minibuffers);
defsubr (&Sminibuffer_prompt_end);
defsubr (&Sminibuffer_contents);
defsubr (&Sminibuffer_contents_no_properties);

5
src/window.c
View file

@ -2663,12 +2663,15 @@ static void
decode_next_window_args (Lisp_Object *window, Lisp_Object *minibuf, Lisp_Object *all_frames)
{
struct window *w = decode_live_window (*window);
Lisp_Object miniwin = XFRAME (w->frame)->minibuffer_window;
XSETWINDOW (*window, w);
/* MINIBUF nil may or may not include minibuffers. Decide if it
does. */
if (NILP (*minibuf))
*minibuf = minibuf_level ? minibuf_window : Qlambda;
*minibuf = this_minibuffer_depth (XWINDOW (miniwin)->contents)
? miniwin
: Qlambda;
else if (!EQ (*minibuf, Qt))
*minibuf = Qlambda;

4
src/window.h
View file

@ -1124,10 +1124,6 @@ extern Lisp_Object echo_area_window;
extern EMACS_INT command_loop_level;
/* Depth in minibuffer invocations. */
extern EMACS_INT minibuf_level;
/* Non-zero if we should redraw the mode lines on the next redisplay.
Usually set to a unique small integer so we can track the main causes of
full redisplays in `redisplay--mode-lines-cause'. */