* src/xdisp.c (handle_invisible_prop): Avoid inflooping when the
string has an invalid %-construct in it and is displayed as part
of mode-line or header-line.  (Bug#26586)

* src/nsterm.m (ns_draw_fringe_bitmap): Revert key-mashing accident.

* lisp/frame.el (frame-restack): Call ns-frame-restack.
* src/keyboard.c (kbd_buffer_get_event) [HAVE_NS]: Enable
MOVE_FRAME_EVENT handling.
* src/frame.h:
* src/frame.c: Enable 'z-group', 'undecorated' and 'parent' frame
definitions.
* src/nsfns.m: Add x_set_z_group, x_set_parent_frame and
x_set_undecorated (Cocoa only) to handler struct.
(Fx_create_frame): Handle 'z-group', 'parent-frame' and 'undecorated'
frame parameter.
(Fns_frame_restack): New function.
* src/nsmenu.m (free_frame_tool_bar, update_frame_tool_bar):
FRAME_TOOLBAR_HEIGHT is no longer a variable.
* src/nsterm.h (NS_PARENT_WINDOW_LEFT_POS, NS_PARENT_WINDOW_TOP_POS):
Add #defines to find the screen position of the parent frame.
(NS_TOP_POS): Remove defun.
(EmacsView): Remove redundant toolbar variables and add createToolbar
method.
(FRAME_NS_TITLEBAR_HEIGHT, FRAME_TOOLBAR_HEIGHT): Always calculate the
values instead of storing them in a variable.
* src/nsterm.m (x_set_offset, windowDidMove): Take parent frame
position into account when positioning frames.
(initFrameFromEmacs): Remove toolbar creation code and handle new
frame parameters.
(x_set_window_size): Remove toolbar height calculation.
(x_set_z_group):
(x_set_parent_frame):
(x_set_undecorated) [NS_IMPL_COCOA]: New function.
(x_destroy_window): Detach parent if child closes.
(updateFrameSize): Change NSTRACE message to reflect new reality and
no longer reset frame size.
(windowWillResize): Don’t change NS window name when the titlebar
is invisible.
(createToolbar): Move toolbar creation code into it’s own method.
(toggleFullScreen): FRAME_TOOLBAR_HEIGHT and FRAME_NS_TITLEBAR_HEIGHT
are no longer variables.
(windowDidMove): Fire MOVE_FRAME_EVENT Emacs event.

Co-authored-by: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>

* src/conf_post.h (HAVE_WORKING_VFORK): Don't undef.
(vfork): Don't define.
* src/process.c (create_process) [DARWIN_OS]: Use fork if pty_flag is
set, otherwise vfork.
* src/callproc.c (call_process) [DARWIN_OS]: Use TIOCNOTTY to detach
the controlling terminal instead of setsid.

* src/coding.c (encode_coding_utf_8): Now extern.
* src/terminal.c (terminal_glyph_code) [HAVE_STRUCT_UNIPAIR_UNICODE]:
Check for UTF-8, not just for multibyte.

* src/process.c (Faccept_process_output): Don't assume a thread's
name is always a string.

* src/coding.h (enum coding_system_type, enum end_of_line_type):
Remove; unused.