* lisp/ido.el: Use first-completion instead of next-completion.

* lisp/minibuffer.el (completion--insert): Put completion--string
text property on prefix and suffix as well.

* lisp/simple.el (first-completion, last-completion): New commands.
(next-completion): Rewrite to fix many bugs reported in
bug#54374, bug#55289, bug#55430.
(choose-completion): Use the text property completion--string that
allows to select a completion when point is on its prefix or suffix.
(switch-to-completions): Use first-completion instead of next-completion,
and last-completion instead of previous-completion.

* test/lisp/minibuffer-tests.el (completion-auto-select-test)
(completion-auto-wrap-test, completions-header-format-test)
(completions-affixation-navigation-test): Uncomment fixed lines.

* test/lisp/minibuffer-tests.el (completing-read-with-minibuffer-setup):
New macro based on xdisp-tests--in-minibuffer.
(completion-auto-help-test, completion-auto-select-test)
(completion-auto-wrap-test, completions-header-format-test)
(completions-affixation-navigation-test): New tests.

* lisp/eshell/esh-cmd.el (eshell-subcommand-bindings)
(eshell-command-to-value): Set 'eshell-in-pipeline-p' to nil.

* test/lisp/eshell/eshell-tests.el
(eshell-test/subcommand-reset-in-pipeline)
(eshell-test/lisp-reset-in-pipeline): New tests (bug#55620).

* test/lisp/erc/erc-dcc-tests.el
(erc-dcc-tests--dcc-handle-ctcp-send): Shadow hook to prevent the
erc-button module from interfering with tests that use this helper.

* test/src/comp-tests.el (comp-deftest): Ensure that no files are left
behind (bug#55611).

* test/src/buffer-tests.el (test-restore-buffer-modified-p): Clean
up autosave file in /tmp.

* lisp/eshell/esh-cmd.el (eshell-execute-pipeline): Use 'make-symbol'
for headproc and tailproc.
(eshell-do-pipelines, eshell-do-pipelines-synchronously): Adapt to the
above.

* test/lisp/eshell/eshell-tests.el (eshell-test/pipe-subcommand)
(eshell-test/pipe-subcommand-with-pipe): New test.

* doc/misc/eshell.texi (Bugs and ideas): Remove item about piping to
process from loop; this commit fixes it (bug#55590).

* test/manual/etags/el-src/emacs/lisp/progmodes/etags.el
(tags-apropos-additional-actions):
* lisp/window.el (delete-window-choose-selected):
* lisp/vc/ediff-merg.el (ediff-combination-pattern):
* lisp/vc/diff.el (diff-no-select):
* lisp/tab-bar.el (tab-bar-new-tab-choice):
* lisp/simple.el (next-error-message-highlight):
(backward-delete-char-untabify):
* lisp/ses.el (ses-jump-cell-name-function):
* lisp/org/org.el (org-latex-to-html-convert-command):
* lisp/org/org-agenda.el (org-agenda-sorting-strategy):
* lisp/net/tramp.el (tramp-default-file-modes):
* lisp/net/newst-treeview.el
(newsticker-treeview-use-feed-name-from-url-list-in-treeview):
* lisp/net/eww.el (eww-auto-rename-buffer):
* lisp/mwheel.el (mouse-wheel-scroll-amount):
* lisp/mail/rmail.el (rmail-re-abbrevs):
* lisp/info.el (Info-history-forward-menu):
* lisp/gnus/nnselect.el (nnselect-retrieve-headers-override-function):
* lisp/gnus/gnus-start.el (gnus-subscribe-hierarchical-interactive):
* lisp/fringe.el (fboundp):
* lisp/eshell/esh-var.el (eshell-variable-aliases-list):
* lisp/emacs-lisp/checkdoc.el (checkdoc-column-zero-backslash-before-paren):
* lisp/dired-aux.el (dired-confirm-shell-command):
* lisp/calendar/calendar.el (calendar-time-zone-style):
* lisp/ansi-color.el (ansi-color-faces-vector):
(ansi-color-names-vector): Audit use of various single quotes in
Lisp doc strings.