* lisp/repeat.el (repeat-map): New autoloaded global variable.
(repeat-post-hook): Use 'repeat-map' when non-nil
and reset it to nil afterwards.
(repeat-post-hook): Keep the current prefix when
'repeat-keep-prefix' is non-nil.

* lisp/window.el (other-window-repeat-map): Add "O" that sets
'repeat-map' to 'other-window-repeat-map' before calling
'(other-window -1)'.

https://lists.gnu.org/archive/html/emacs-devel/2021-03/msg01387.html

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.

* doc/emacs/basic.texi (Repeating): Document repeat-mode.

* lisp/repeat.el (repeat-exit-key): New defcustom.
(repeat-mode): New global minor mode.
(repeat-post-hook): New function.

* lisp/bindings.el (undo-repeat-map): New variable.
(undo): Put 'repeat-map' property with
'undo-repeat-map'.
(next-error-repeat-map): New variable.
(next-error, previous-error): Put 'repeat-map' property with
'next-error-repeat-map'.

* lisp/window.el (other-window-repeat-map): New variable.
(other-window): Put 'repeat-map' property with
'other-window-repeat-map'.
(resize-window-repeat-map): New variable.
(enlarge-window, enlarge-window-horizontally)
(shrink-window-horizontally, shrink-window): Put 'repeat-map'
property with 'resize-window-repeat-map'.

To scroll up/down the current displayed occurrence/error
without abandon the Occur/Grep buffer.

Add also a command 'recenter-other-window' to recenter
the other window from any kind of buffer.

* lisp/window.el (recenter-other-window): New command.
Bind recenter-other-window to S-M-C-l (Bug#46119).

* lisp/simple.el (recenter-current-error): New command.
* lisp/progmodes/grep.el (grep-mode-map):
Delete bidings for n and p.

* lisp/progmodes/compile.el (compilation-minor-mode-map):
Move here the n and p bindings.
Bind `recenter-current-error' to l.
* lisp/replace.el (occur-mode-map):
Same.

* doc/emacs/windows.texi (Other Window):
* doc/emacs/display.texi (Recentering):
Document recenter-other-window.

* etc/NEWS (Changes in Specialized Modes and Packages in Emacs 28.1):
Announce the changes.

7355209f53 (origin/emacs-27) * lisp/window.el (recenter-top-bottom): ...
dc78f8a4ea (emacs-27) url-http.el: Special-case NTLM authentication
85b0137858 * lisp/isearch.el (isearch-lazy-highlight): Fix defcustom ...
cbeda21083 Sync latest SKK-JISYO.L

* lisp/abbrev.el:
* lisp/bindings.el (mode-line-mule-info, mode-line-modified)
(mode-line-remote, mode-line-process)
(mode-line-buffer-identification):
* lisp/buff-menu.el (Buffer-menu-files-only):
* lisp/files.el (buffer-file-number, buffer-file-read-only)
(local-write-file-hooks, write-contents-functions)
(file-local-variables-alist, dir-local-variables-alist)
(save-buffer-coding-system, buffer-save-without-query):
* lisp/font-core.el (font-lock-defaults):
* lisp/font-lock.el (font-lock-keywords-case-fold-search)
(font-lock-syntactically-fontified)
(font-lock-extend-after-change-region-function)
(font-lock-extend-region-functions, font-lock-major-mode):
* lisp/menu-bar.el (list-buffers-directory):
* lisp/simple.el (next-error--message-highlight-overlay)
(next-error-buffer, next-error-function)
(next-error-move-function, goto-line-history)
(minibuffer-default-add-done, undo-extra-outer-limit):
* lisp/tab-bar.el (tab-switcher-column):
* lisp/term/ns-win.el (ns-select-overlay):
* lisp/window.el (window-size-fixed, window-area-factor)
(window-group-start-function, window-group-end-function)
(set-window-group-start-function)
(recenter-window-group-function)
(pos-visible-in-window-group-p-function)
(selected-window-group-function)
(move-to-window-group-line-function): Prefer defvar-local.

* lisp/window.el (display-buffer-in-previous-window): Support the value of
'previous-window' entry as a symbol for variable name (bug#45688).

* lisp/window.el (display-buffer-use-some-window): Remove spurious
message included in 2021-01-11 "Support using auth-source for
NickServ passwords in ERC" (bug#45340#44).

488204cdc6 (origin/emacs-27) Remove one of recently added warnings ab...
55bc1560ac Fix assertion failure in window_box_height (Bug#45737)
27743e9e70 Fix cl-concatenate inlining
32a3758c84 Fix infloop in 'pixel-scroll-mode'
74d18957b8 Fix inhibiting the default.el loading in user init file