* lisp/net/tramp.el (tramp-security-key-timeout-regexp): New defcustom.
(tramp-action-show-and-confirm-message): Don't use timeout, check
for the timeout message of the ssh command.
* lisp/mouse.el (context-menu-map): Add menu title "Context Menu"
propertized with the text property 'hide'.
* src/menu.c (x_popup_menu_1): Don't show the title with the non-nil
text property 'hide' on GTK and NS.
* doc/lispref/nonascii.texi (Terminal I/O Encoding):
* doc/emacs/mule.texi (Terminal Coding):
* lisp/international/mule.el (set-keyboard-coding-system):
Document that 'set-keyboard-coding-system' has no effect on modern
MS-Windows systems. (Bug#15289)
* doc/misc/mh-e.texi, lisp/mh-e/mh-e.el: Update references to
SourceForge with current URLs and a note that MH-E development
no longer occurs in that repository.
* test/lisp/files-tests.el (files-tests-buffer-offer-save)
(files-tests-save-buffers-kill-emacs--asks-to-save-buffers):
`read-event' is called with arguments.
* doc/misc/cl.texi (Structures): Rename the slot "name" in the
examples to "first-name", since we're talking about the names of
slots a lot here, and having a slot with the name "name" makes the
examples somewhat confusing.
* lisp/emacs-lisp/cl-macs.el (cl-defstruct): Clarify certain
things about slots (bug#14278).
* src/nsterm.m ([EmacsLayer initWithColorSpace:]): Use the colorspace
setter.
([EmacsLayer setColorSpace:]): Sometimes we seem to get null
colorspaces, so set a default in this case.
([EmacsLayer getContext]): Check whether there's been a surface or
graphics context allocation failure and log it.
The new entry appears next to "Find Definition" and like it only
appears when the context menu was invoked on an identifier.
* lisp/progmodes/prog-mode.el (prog-context-menu): New menu entry.
* lisp/progmodes/xref.el (xref-find-references-at-mouse): New
function, analogous to `xref-find-definitions-at-mouse`.
* lisp/progmodes/xref.el (xref-backend-references): Add messages to
show the user that something is happening instead of silently freezing
during the frequently long synchronous searches for references.
* lisp/progmodes/xref.el (xref-match-item): Change type for
:location from `xref-file-location`, which was likely a mistake,
to `xref-location`. This allows `xref-make-match` to take
arguments of any subtype of `xref-location` (bug#50067).
* lisp/progmodes/prog-mode.el (prog-context-menu):
Add xref operations to the context menu even if xref hasn't been
loaded yet; the functions involved are autoloaded (bug#50067).
* doc/lispref/modes.texi (Major Mode Conventions): Add conventions
of setting menu-bar menus and context menus for a major mode.
* doc/emacs/frames.texi (Menu Mouse Clicks): Fix description of
context menu functionality.
* lisp/progmodes/project.el (project-buffers): New generic function.
(project--read-project-buffer): Use it here (bug#49264).
(project--buffers-to-kill): And here.
(project-buffers): Specialized implementation for vc-project.
* lisp/progmodes/cc-defs.el (c-tentative-buffer-changes)
(c-tnt-chng-record-state, c-tnt-chng-cleanup): Enhance such that a
buffer-undo-list of t is handled specially, so that a nil isn't consed onto
it. Thus garbage collection can't later remove the (nil . t) from the end of
the buffer-undo-list, causing an infinite loop.
