* lisp/mwheel.el (mouse-wheel-scroll-amount): Change 'shift' default value
from 5 to 'hscroll'. Add new option "Scroll horizontally" for 'hscroll'.
(mwheel-scroll): Handle value 'hscroll' and call mwheel-scroll-left-function
or mwheel-scroll-right-function.
* doc/emacs/frames.texi (Mouse Commands): Update for horizontal scrolling
with Shift modifier.
* lisp/mwheel.el (mouse-wheel-scroll-amount): Change default value 5 to 1
and shift default value from 1 to 5.
Default value is changed as discussed in etc/TODO.
* src/process.c (update_process_mark): Make into its own function.
(Fmake_process, Fmake_pipe_process, Fmake_serial_process)
(connect_network_socket): Use it.
* src/comp.c (syms_of_comp): Define and initialize
'Vcomp_installed_trampolines_h'.
(Fcomp__install_trampoline): Fill 'Vcomp_installed_trampolines_h'
* lisp/emacs-lisp/comp.el (comp--subr-safe-advice): Make use of
`comp-installed-trampolines-h' to guard against installing a
trampoline twice.
Add a Lisp side entry-point to be called to make primitive adivicing
effective.
* lisp/emacs-lisp/comp.el (comp-trampoline-sym)
(comp-trampoline-filename): New substs.
(comp-make-lambda-list-from-subr, comp-search-trampoline)
(comp-tampoline-compile): New functions
* lisp/gnus/gnus-util.el (gnus-write-active-file): In case of group
names with spaces in them (see Bug#42823). Names are later read with
`read', so this should be quite robust.
* lisp/simple.el (goto-line-read-args): New function with code from goto-line.
(goto-line): New arg RELATIVE. Also use 'widen-automatically' to
leave all lines accessible in the narrowed buffer.
(goto-line-relative): New command.
* lisp/info.el (Info-mode-map): Remap 'goto-line' to 'goto-line-relative'.
* doc/emacs/basic.texi (Moving Point):
* doc/emacs/display.texi (Optional Mode Line): Mention goto-line-relative.
* src/comp.c (Fcomp__install_trampoline): New function to
install a subr trampoline into the function relocation table.
Once this is done any call from native compiled Lisp to the
related primitive will go through the `funcall' trampoline
making advicing effective.
* test/lisp/textmodes/css-mode-tests.el:
* test/lisp/progmodes/ruby-mode-tests.el: Remove TODO to convert test
files into unit tests. The files are still useful for debugging.
Ref: https://lists.gnu.org/r/emacs-devel/2020-09/msg01906.html
* lisp/emacs-lisp/lisp.el (forward-sexp, backward-sexp, forward-list)
(backward-list, down-list, up-list, mark-sexp, kill-sexp)
(backward-kill-sexp): Remove unsightly scan-error when running
interactively and no further movement by sexp can be made (bug#43489).
* lisp/wid-edit.el (widget-specify-field): Extend check for adding the
boundary overlay. Plus, a minor comment indentation fix.
(character widget): Tweak the valid-regexp to allow the newline
character.
* test/lisp/wid-edit-tests.el (widget-test-character-widget-value)
(widget-test-editable-field-widget-value): New tests (bug#15925).
* lisp/gnus/nnselect.el (numbers-by-group,
nnselect-request-update-info, nnselect-push-info): Handle all three
mark types ('tuple, 'range, 'list) and general speedups.
This fixes forward-comment, scan-lists, and parse-partial-sexp.
* src/syntax.c (forw_comment): Detect and skip an escaped comment ender
(e.g. \*/ in C) when comment-end-can-be-escaped is non-nil.
* lisp/net/shr.el (shr-insert): Speed up regularising spaces --
the vast majority of the spaces are already OK, so transforming
" " to " " just takes time.
* src/xdisp.c (resize_mini_window): When we show only part of the
mini-window's contents, make sure the window-start position is at
the beginning of a screen line. (Bug#43519)
