* lisp/cmuscheme.el (scheme-load-file, scheme-compile-file):
* lisp/comint.el (comint-get-source):
* lisp/emulation/viper-cmd.el (viper-quote-region, viper-kill-buffer)
(viper-query-replace, viper-read-string-with-history):
* lisp/eshell/esh-mode.el (eshell-find-tag):
* lisp/gnus/gnus-sum.el (gnus-articles-to-read)
(gnus-summary-search-article-forward)
(gnus-summary-search-article-backward):
* lisp/international/mule-cmds.el (set-input-method, toggle-input-method)
(describe-input-method, set-language-environment)
(describe-language-environment):
* lisp/mh-e/mh-gnus.el (mh-mml-minibuffer-read-disposition):
* lisp/mh-e/mh-letter.el (mh-insert-letter):
* lisp/mh-e/mh-mime.el (mh-display-with-external-viewer)
(mh-mime-save-parts, mh-mh-forward-message)
(mh-mml-query-cryptographic-method, mh-minibuffer-read-type):
* lisp/mh-e/mh-seq.el (mh-read-seq, mh-read-range):
* lisp/mh-e/mh-utils.el (mh-prompt-for-folder):
* lisp/progmodes/etags.el (find-tag-tag):
(find-tag-noselect, find-tag, find-tag-other-window)
(find-tag-other-frame, find-tag-regexp):
* lisp/progmodes/idlwave.el (idlwave-find-module):
* lisp/progmodes/inf-lisp.el (lisp-load-file, lisp-compile-file):
* lisp/progmodes/tcl.el (tcl-load-file, tcl-restart-with-file):
* lisp/progmodes/xref.el (xref--read-identifier):
(xref-find-definitions, xref-find-definitions-other-window)
(xref-find-definitions-other-frame, xref-find-references):
* lisp/ses.el (ses-read-printer):
(ses-read-cell-printer, ses-read-column-printer)
(ses-read-default-printer, ses-define-local-printer):
* lisp/subr.el (read-number):
* lisp/term.el (term-get-source):
* src/minibuf.c (read-buffer): Remove prompt suffix and
use 'format-prompt'.
* lisp/minibuffer.el (format-prompt): Ignore DEFAULT empty strings
(bug#47286).

This happened with minibuffer-follows-selected-frame set to t.

* doc/emacs/mini.texi (Basic Minibuffer): State where a command's action takes
place when a minibuffer's frame has been deleted.

* lisp/window.el (window--before-delete-windows, record-window-buffer): Take
into account that minibuffers are now recorded on w->prev_buffers field.

* src/fns.c (merge_c): New version of `merge' taking a C function, rather than
a Lisp function as the comparison function.

* src/frame.c (do_switch_frame): Pass arguments sf and for_deletion to
move_minibuffers_onnto_frame.

* src/lisp.h (top level): Declare merge_c and
move_minibuffers_onto_selected_frame.

* src/minibuf.c (MB_frame): New Lisp_Object recording the minibuffer's frame.
(choose_minibuf_frame): Remove all code except that which sets minibuf_window
to the current frame's minibuffer.
(minibuffer_ent_greater): New comparison function, passed to merge_c.
(zip_minibuffer_stacks): New function.
(move_minibuffers_onto_frame): Renamed from `move_minibuffer_onto_frame' given
two arguments, the old frame and for_deletion, and simplified.  Minibuffers
are now stacked in the mini-window's ->prev_buffers field.
(read_minibuf): Several detailed amendments.
(exp_MB_frame): New Lisp_Object, the expired minibuffer's frame.
(read_minibuf_unwind): Search for the expired minibuffer's frame, rather than
taking it from (unreliable) variables.  Switch temporarily to this frame for
tidying up operations.
(minibuffer_unwind): New function which pops a stacked minibuffer.
(syms_of_minibuf): Call staticpro for the two new Lisp variables.

* src/window.c (Fset_window_configuration): Don't record minibuffers with
record-window-buffer.

* src/xdisp.c (gui_consider_frame_title): Remove redundant Fselect_window,
which caused an unwanted frame switch.  Amend the arguments to
format_mode_line_unwind_data to match.

* lisp/minibuffer.el (exit-minibuffer): When in a minibuffer, throw an error
should the command loop nesting level be wrong.

* src/lisp.h (minibuffer_quit_level): declare as an extern.
(command_loop_level): Move definition from src/window.h

* src/window.h (command_loop_level): move definition to src/lisp.h.

* src/eval.c (minibuffer_quit_level): Move this variable to file level from
being a static inside internal_catch.
(internal_catch): Simplify the logic.

* src/minibuf.c (Vcommand_loop_level_list): New variable.
(move_minibuffer_onto_frame): Set the major mode of  *Minibuf-0*.
(Fminibuffer_innermost_command_loop_p): New primitive.
(Fabort_minibuffers): Check the command loop level before throwing t to 'exit,
and set minibuffer_quit_level too.
(read_minibuf): New variable calling_window.
Before stacking up minibuffers on the current mini-window, check that the
mini-window is not the current one.
Do not call choose_minibuf_frame from read_minibuf's unwinding process.
Bind calling_frame and calling_window over the recursive edit.
Set the new minibuffer's major mode directly.
Remove the switching away from the minibuffer after the recursive edit.
(get_minibuffer): Record the command loop level in new variable
Vcommand_loop_level_list.  No longer set the major mode of a returned
minibuffer.
(minibuf_c_loop_level): New function.
(read_minibuf_unwind): New variables calling_frame, calling_window are unbound
from the binding stack.  Remove old variable `window', which could not be set
reliably to the expired mini-window.
The expired minibuffer is determined as the nth in the list, rather than the
contents of the current or previous mini-window.
Switch the current window away from the mini-window here (moved from
read_minibuf).

src/minibuf.c (get_minibuffer): Move the XSETCAR which writes the new
minibuffer into Vminibuffer_list to immediately after the MB's creation, so
that the list is in a consistent state before calling fundamental-mode or
minibuffer-inactive-mode.

...when enable-recursive-minibuffers is non-nil, and several minibuffers are
activated from different frames.  Also set the major mode of a reused active
minibuffer to `fundamental-mode' - up till now it's been
minibuffer-inactive-mode.

* src/minibuf.c (read_minibuf): with the indicated settings of variables,
"stack up" all containing minibuffers on the mini-window of the current
frame.  Delete another, now superfluous such stacking up.
(set_minibuffer_mode): New function.
(get_minibuffer): Call the above new function (twice), in place of inline
code, ensuring active minibuffers are never left in minibuffer-inactive-mode.

* doc/lispref/elisp.texi (Top): Add a link.
* doc/lispref/errors.texi (Standard Errors): Mention the new error.

* doc/lispref/minibuf.texi (Minibuffers): Add a link.
(Inhibiting Interaction): New node.

* src/data.c (syms_of_data): Define the `inhibited-interaction' error.

* src/lisp.h: Export the barfing function.

* src/lread.c (Fread_char, Fread_event, Fread_char_exclusive):
Barf if inhibited.

* src/minibuf.c (barf_if_interaction_inhibited): New function.
(Fread_from_minibuffer, Fread_no_blanks_input): Barf if inhibited.
(syms_of_minibuf): Define the `inhibit-interaction' variable.

* src/minibuf.c (choose_minibuf_frame): Don't compare Lisp_Objects
with '!='.  Use 'EQ' instead.

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.

* src/minibuf.c (syms_of_minibuf) <Qhistory_length>: Remove unused
DEFSYM.

Run "TZ=UTC0 admin/update-copyright".