* src/editfns.c (Ftranspose_regions): Remove an obsolete comment about
memmove, following up to commit 72af86bd8c of 8 Jul 2010 by Andreas
Schwab and commit 354f9f0fc6 of 23 Feb 2016 by Fredrik Bergroth,
both of which added calls to memmove.
* src/xdisp.c (produce_stretch_glyph): Use the correct face for
non-ASCII characters. Support :relative-width display spec on
Lisp strings, not just on buffer text.
* src/w32inevt.c (do_mouse_event): Reset the 'mouse_moved' flag of
the selected frame. Without that, this flag might remain set on a
TTY frame that is not displayed.
* lisp/mouse.el (mouse-drag-track):
* lisp/mouse-drag.el (mouse-drag-drag): Set 'track-mouse' to some
value neither t nor nil.
* src/keyboard.c (make_lispy_position): If track_mouse is Qt,
report event on tool or tab bar (Bug#51794).
* src/callproc.c (emacs_spawn) <fork_done>: Define the label only
if USABLE_POSIX_SPAWN is defined, to avoid a compiler warning.
(cherry picked from commit a8fc080851)
posix_spawn is less error-prone than vfork + execve, and can make
better use of system-specific enhancements like 'clone' on Linux. Use
it if we don't need to configure a pseudoterminal.
Backported from commit a60053f836.
Unlike that commit, only define USABLE_POSIX_SPAWN on macOS, because
there posix_spawn is much faster than vfork.
Don't merge to master.
* configure.ac (HAVE_SPAWN_H, HAVE_POSIX_SPAWN)
(HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR)
(HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR_NP)
(HAVE_POSIX_SPAWNATTR_SETFLAGS, HAVE_DECL_POSIX_SPAWN_SETSID): New
configuration variables.
* src/callproc.c (USABLE_POSIX_SPAWN): New configuration macro.
(emacs_posix_spawn_init_actions)
(emacs_posix_spawn_init_attributes, emacs_posix_spawn_init): New
helper functions.
(emacs_spawn): Use posix_spawn if possible.
(cherry picked from commit a60053f836)
* src/coding.c (Fdecode_coding_region): Doc fix.
* doc/lispref/nonascii.texi (Coding System Basics)
(Explicit Encoding): Explain the significance of using 'undecided'
in 'decode-coding-*' functions.
* src/keyboard.c (Fposn_at_x_y): Clarify that the Y coordinate
includes the header-line and the tab-line. (Bug#51590)
* doc/lispref/windows.texi (Window Sizes, Splitting Windows)
(Textual Scrolling, Coordinates and Windows): Fix/remove improper
or confusing uses of "text area" of a window.
* src/nsterm.m (ns_init_locale): If not already set, set LC_ALL to the
current locale ID so that dates, currencies, etc. use the settings
configured in the operating system. (Bug#51321)
* src/dispnew.c (adjust_glyph_matrix, prepare_desired_row): Leave
room for the border glyph only if the window does actually have
the right margin. (Bug#51521)
Don't merge to master. This is a safe-for-release fix for Bug#50752.
* src/keymap.c (lookup_key_1): Factor out function from
Flookup_key.
(Flookup_key): Be case insensitive when looking for Qmenu_bar
items. (Bug#50752)
* test/src/keymap-tests.el
(keymap-lookup-key/mixed-case)
(keymap-lookup-key/mixed-case-multibyte): New tests.
When the mouse pointer is pressed on the tab bar, moved out of the tab
bar, and moved back in, it would be more appropriate to behave like
other programs by displaying the item as sunken.
* src/xdisp.c (note_tab_bar_highlight): Display item as sunken if the
mouse pointer returns to the tab bar down.
* admin/unidata/blocks.awk: Remove emoji overrides for codepoints with
Emoji_Presentation = No, they're no longer necessary.
* lisp/composite.el: Remove #xFE0F (VS-16) from the range handled by
`compose-gstring-for-variation-glyph' so it can be handled by
`font_range'.
* src/composite.c (syms_of_composite): New variable
`auto-composition-emoji-eligible-codepoints'.
* admin/unidata/emoji-zwj.awk: Generate value for
`auto-composition-emoji-eligible-codepoints'. Add
`composition-function-table' entries for 'codepoint + U+FE0F' for
them.
* src/font.c (codepoint_is_emoji_eligible): New function to check if
we should try to use the emoji font for a codepoint.
(font_range): Use it.
* doc/lispref/buffers.texi (Current Buffer, Buffer List): Update
references to 'selected-window'.
* doc/lispref/elisp.texi (Top): Move up Selecting Windows section
in front of Window Sizes section.
* doc/lispref/frames.texi (Creating Frames): Say window system
instead of windowing system.
(Frame Layout): Add Tab Bar to layout.
(Layout Parameters): Add 'tab-bar-lines'.
(Input Focus): Say window system window instead of window
manager window. Fix reference to 'selected-window'.
* doc/lispref/objects.texi (Window Type): Minor rewrite.
* doc/lispref/windows.texi (Basic Windows): Rewrite. Settle on
term 'window system window' for disambiguation with our windows.
Move 'selected-window' description to Selecting Windows section.
Move schematic of window structure here. Use 'decorations' for
objects outside the window body. Say that the areas reserved
for continuation and truncation glyphs, vertical dividers and
line numbers are part of the window body.
(Windows and Frames): Minor rewrite, adding and fixing some
cross references. Move live window schematic to 'Basic Windows'
section.
(Selecting Windows): Move section in front of Window Sizes
section. Move description of 'selected-window' here. Move up
description of 'frame-selected-window' and
'set-frame-selected-window'. Update and move description of
'window-bump-use-time' here.
(Window Sizes): Throughout use the term 'decorations' instead of
enumerating them individually. Add 'window-tab-line-height'
description.
(Resizing Windows): Again use the term 'decorations' instead of
enumerating them individually.
(Splitting Windows): Minor fix.
(Cyclic Window Ordering): Improve descriptions of 'get-lru-window'
and 'get-mru-window'. Move 'window-bump-use-time' to Selecting
Windows section.
(Coordinates and Windows, Window Configurations): Once more use
the term 'decorations' instead of enumerating them individually.
* src/window.c (Fwindow_bump_use_time): Move after
'window-use-time'. Make it work for live windows only. Make
WINDOW argument optional. Update doc-string.
* lisp/tab-bar.el (tab-bar--event-to-item)
(tab-bar-mouse-move-tab): Set tab-bar-drag-maybe to nil.
(tab-bar-mouse-down-1): Set tab-bar-drag-maybe to t.
* src/xdisp.c (note_mouse_highlight): Set cursor to 'hand_cursor'
when tab_bar_drag_maybe is true.
(syms_of_xdisp): New variable tab-bar-drag-maybe.
* src/nsfns.m (ns_change_tab_bar_height): New function.
(ns_set_tab_bar_lines): Check tab bar height and set tab bar
accordingly.
* src/nsterm.m (ns_clear_under_internal_border): Clear internal border
correctly when there is a tab bar.
(ns_create_terminal): Add ns_change_tab_bar_height.
(mouseDown): Handle tab bar mouse click events.
* src/image.c (svg_load_image): Check how many bytes were actually
written to the buffer. Don't check xmalloc return value as xmalloc
doesn't return if it fails.
* doc/lispref/display.texi (Size of Displayed Text): Fix entry
on 'window-text-pixel-size'.
* lisp/window.el (window--dump-window): Dump tab-line-height and
scroll-bar-height too.
(window--min-size-1): Take 'window-tab-line-height' into account.
* src/xdisp.c (Fwindow_text_pixel_size): Fix doc-string of
'window-text-pixel-size'. Rename last argument to 'MODE-LINES'.
