* src/xrdb.c (get_environ_db): Fix typo when handling
~/.Xdefaults-HOSTNAME.

* src/keyboard.c (read_char): Prevent redsiplay right after
ns-unput-working-text event.
* src/nsterm.m ([EmacsView insertText:]): Partially revert commit
ba042176.
([EmacsView firstRectForCharacterRange:]): Fix candidate window
position when cursor is on echoarea.
([EmacsView mouseDown:])
([EmacsView windowDidResignKey:]): Don't delete working text.

* src/nsterm.m ([EmacsView copyRect:to:]): Calculate the horizontal
difference instead of just the vertical.
([EmacsView updateLayer]): Fix NSTRACE message.

* src/fns.c (Fload_average): Do not crash or return nonsense
if the load average exceeds most-positive-fixnum/100 (Bug#39577).

* src/lread.c (read1): Guard against two 'struct Lisp_Vector *'
pointers differing only in their most significant bit.  Problem
reported by Pip Cet (Bug#39529#22).

Found by --enable-check-lisp-object-type.

* src/unexmacosx.c (unexec_regions_merge): Align region start addresses to
page boundaries and then merge regions.

Problem reported by Federico Tedin (Bug#39529).
The problem was that dumping uses a hash table based on 'equal'
when purecopying compiled objects, but then modifies the compiled
objects while they are keys in the table.  This no-no was uncovered
by the sxhash fixes in 2020-01-07T19:23:11Z!eggert@cs.ucla.edu.
Eli Zaretski pinpointed the patch that triggered the bug.
* src/lread.c (read1): When reading a compiled object, replace
its docstring with a unique negative integer instead of with 0,
so that purecopy doesn’t unify it with some other compiled object
that happens to have the same Lisp code.

* src/lcms.c (lcms-xyz->jch, lcms-jch->xyz): Swap first line of docstrings.

(new_backquote_flag): Delete variable.
(load_error_old_style_backquotes): Delete function.
(force_new_style_backquotes): Delete variable.
(read_internal_start): Don't obey it any more.

This fixes bug #39585.

* src/callproc.c (call_process): Supply the correct CHARPOS to
signal_after_change (twice).

* src/nsterm.m (ns_update_end):
(ns_clear_frame): Remove forced draws.
(ns_draw_fringe_bitmap):
(ns_dumpglyphs_image): No longer need to invert images as the context
is already flipped.
([EmacsView updateFrameSize:]):
([EmacsView initFrameFromEmacs:]): Use new function.
([EmacsView createDrawingBuffer]): Replaces createDrawingBufferWithRect:.
([EmacsView focusOnDrawingBuffer]): Set CGImage context.
([EmacsView windowDidChangeBackingProperties:]): Use new function.
([EmacsView copyRect:to:]): Copy using CGImages.
([EmacsView wantsUpdateLayer]):
([EmacsView updateLayer]): New Functions.
([EmacsView drawRect:]): We no longer do anything special here for
Cocoa.
([EmacsView windowDidChangeBackingProperties:]): Fix indentation and
add NSTRACE.

This reverts commit ba042176.

Do not merge to master (bug#38851)

* src/fontset.c (fontset_add): Fix off-by-one error at TO.
(Bug#39482)

(doc/emacs/screen.texi)
(doc/lispintro/emacs-lisp-intro.texi)
(doc/misc/calc.texi)
(doc/misc/gnus.texi)
(doc/misc/sc.texi)
(lisp/align.el)
(lisp/allout-widgets.el)
(lisp/allout.el)
(lisp/emacs-lisp/gv.el)
(lisp/font-lock.el)
(lisp/gnus/mm-util.el)
(lisp/mail/feedmail.el)
(lisp/mail/sendmail.el)
(lisp/mail/supercite.el)
(lisp/org/org-attach.el)
(lisp/progmodes/cc-langs.el)
(lisp/progmodes/idlw-shell.el)
(lisp/ps-print.el)
(lisp/simple.el)
(src/cmds.c)
(src/editfns.c)
(src/frame.h)
(src/regex-emacs.c)
(src/xfaces.c): Replace "different than" by "different from".

* src/composite.c (Fcomposition_get_gstring): Allow unibyte
strings if they are pure ASCII, by copying text into a
multibyte string.

* src/xdisp.c (get_window_cursor_type): Fix indentation and
line-filling.
* doc/lispref/frames.texi (Cursor Parameters):
* doc/emacs/display.texi (Cursor Display):
* etc/NEWS: Fix wording and capitalization of the last change.

This allows control of the minimum size of a masked image under
which the box cursor becomes hollow.
* buffer.c (cursor-type): Add commentary about (box . SIZE)
'cursor-type'.
* xdisp.c (get_specified_cursor_type): Check for 'cursor-type'
of the form (box . SIZE).
(get_window_cursor_type): Check masked image size for
(box . SIZE) 'cursor-type'.

* doc/emacs/display.texi (Cursor Display):
* doc/emacs/display.texi (Cursor Parameters): Add description
of (box . SIZE) 'cursor-type'.

* etc/NEWS: Mention the new (box . SIZE) 'cursor-type'.

Fixes Bug#39363.

* configure.ac: Add check for 3-argument version of
pthread_setname_np.
* src/systhread.c (sys_thread_set_name)
[HAVE_PTHREAD_SETNAME_NP_3ARG]: Call pthread_setname_np with
3 arguments.

* src/minibuf.c (read_minibuf): Parse input string after saving
the string to the history list instead of before, in case parsing
signals an error or is interrupted by C-g.  (Bug#39291)

Also, update description of debuginfo and sources to match
Debian and Red Hat more accurately, and move this sad tale
from INSTALL to etc/PROBLEMS which is a better home for it.
* Makefile.in (emacs_srcdir, install-c-src):
* configure.ac (emacs_srcdir, --with-install-srcdir):
* src/epaths.in (PATH_EMACS_SOURCE):
* src/lread.c (emacs-source-directory):
Remove.  All uses removed.
* lisp/emacs-lisp/find-func.el (find-function-C-source):
Do not worry about compressed C sources.
* src/lread.c: Do not include <dosname.h>.

* src/mini-gmp.c, src/mini-gmp.h: Copy from GMP 6.2.0.
This incorporates:
2019-12-05 remove some sizeof(mp_limb_t)
2019-12-04 (mpn_invert_3by2): Remove special code for limb sizes
2019-12-04 (mpn_invert_3by2): Limit size of an intermediate
2019-11-20 (mpn_invert_3by2): Use xor instead of negation
2019-11-19 (mpn_invert_3by2): Move an assert earlier
2019-11-19 (mpn_invert_3by2): Add a new shortcut
2019-11-17 Prepend "unsigned" to MINI_GMP_LIMB_TYPE
2019-11-17 Enable testing with different limb sizes (types)
2019-11-20 Use already defined constants
2019-11-09 Avoid undefined behaviour with small limb sizes

* src/editfns.c (Fformat): Use the correct regexp for describing the
flags in a %-sequence (place the hyphen last).

* src/emacs.c (main): Call ns_init_locale before using the
environment variable that ns_init_locale sets up (Bug#39248).

Without this change, on typical GNU/Linux distributions
like Debian, the first button of ‘C-h f car RET’ does not work
because the source code for ‘car’ is not installed (Bug#37527).
Fix this by installing the (compressed) C source code alongside
the (compressed) Lisp source code that is already installed.
This adds about 3 MB (about 2%) to the size of the installed files
on my platform.
* Makefile.in (emacs_srcdir): New macro.
(epaths-force): Substitute PATH_EMACS_SOURCE.
(install-c-src): New rule, that installs a copy of the C source
code if emacs_srcdir says to.
(install-arch-indep): Depend on it.
* configure.ac (emacs_srcdir): New var.
Add support for --disable-install-srcdir.
* lisp/emacs-lisp/find-func.el (find-function-C-source-directory):
Look in emacs-source-directory first.
(find-function-C-source): Also look for gzipped source files.
* lisp/startup.el (normal-top-level):
Also recode emacs-source-directory.
* src/epaths.in (PATH_EMACS_SOURCE): New macro.
* src/lread.c: Include dosname.h, for IS_ABSOLUTE_FILE_NAME.
(syms_of_lread): New var emacs-source-directory.

* src/nsfns.m (x_set_background_color): Clear the frame after changing
the background color, not before.
* src/nsterm.h (drawingBuffer): New variable.
([EmacsView focusOnDrawingBuffer]):
([EmacsView copyRect:to:]):
([EmacsView createDrawingBufferWithRect:]): New methods.
* src/nsterm.m (ns_update_begin):
(ns_update_end):
(ns_focus):
(ns_unfocus): Handle drawing to offscreen buffer.
(ns_clip_to_row): Use ns_row_rect.
(ns_copy_bits): Remove unused function.
(ns_scroll_run):
(ns_shift_glyphs_for_insert): Use new scrolling method.
(ns_draw_fringe_bitmap):
(ns_dumpglyphs_image): When drawing to the offscreen buffer, flip
images so they appear the right way up.
(ns_dumpglyphs_stretch): Remove unnecessary code.
(ns_draw_window_cursor): Don't disable screen updates.
([EmacsView updateFrameSize:]): Update the size of the offscreen
buffer.
([EmacsView initFrameFromEmacs:]): Create offscreen buffer.
([EmacsView windowDidChangeBackingProperties:]):
([EmacsView createDrawingBufferWithRect:]):
([EmacsView focusOnDrawingBuffer]):
([EmacsView copyRect]): New methods.
([EmacsView viewWillDraw]): Remove method as it no longer does
anything useful.
([EmacsView drawRect:]): Handle drawing from offscreen buffer.

This reverts commit 79464459.

This reverts commit a6ab8db3.

This reverts commit 7e8eee60.

Stop exporting Vprevious_system_time_locale and
Vprevious_system_messages_locale to Elisp.  I did that export by
mistake in 1999, and the Elisp variables have never been used.
Simplifying this cruft should make it easier to fix Bug#39248.
* etc/NEWS: Mention this.
* src/emacs.c (main): Simplify locale initialization.
(synchronize_locale): Simplify.
(Vprevious_system_time_locale, Vprevious_system_messages_locale):
Now static variables not visible to Lisp, and defined only if
HAVE_SETLOCALE.
(Vprevious_system_messages_locale): Define only if LC_MESSAGES.

* src/alloc.c (resize_string_data): The string must be multibyte.
When not bothering to reallocate, do bother to change the byte count.
* test/src/alloc-tests.el (aset-nbytes-change) New test.

Now, functions such as call-proess-region invoke after-change-functions
correctly.

* src/callproc.c (call_process): Call prepare_to_modify_buffer in a single
place, no longer delegating the task to insert_1_both, etc.  Call
signal_after_change in each of two code branches, such that
before-change-functions and after-change-functions are always called in
balanced pairs.

* etc/NEWS: Fix a typo.

* src/xdisp.c (try_window_reusing_current_matrix, try_window_id):
* src/dispnew.c (scrolling_window): Fix typos in comments.

* src/xdisp.c (try_window_reusing_current_matrix, try_window_id):
* src/dispnew.c (scrolling_window) [HAVE_NTGUI]: If
w32-use-visible-system-caret is non-nil, disallow scrolling the
display are in scroll_run_hook.  This avoids copying traces of the
caret, about which Emacs knows nothing, and thus considers those
pixels show the default background.  (Bug#39188)
(gui_update_window_end): Block input only around part of the code,
as we did before this code was extracted from backend-specific
implementations.

* src/w32term.c (w32_update_window_begin, w32_update_window_end):
Only hide/show the caret when redisplaying the window where the
caret is shown.

* src/nsterm.m (ns_free_frame_resources): Clear the output data
pointer to prevent attempting to reuse freed resources (Bug#38748).

* src/w32.c (openat): New function.
* src/w32.h (openat): Add prototype.