Adding the 'keymap' property enabled RET but broke the mouse-action.
* lisp/progmodes/flymake.el
(flymake--diagnostics-buffer-entries): Use 'action' instead of 'keymap'.
* lisp/progmodes/flymake.el
(flymake-diagnostics-buffer-mode-map): Don't bind [mouse-1].
(flymake-show-diagnostic): Rename from
flymake-show-diagnostic-at-point. Really use another window.
(flymake-goto-diagnostic): Rename from
flymake-goto-diagnostic-at-point.
(flymake--diagnostics-buffer-entries): Use a button just for
the message bit.
Don't create text-buttons unnecessarily, just bind RET and SPC in the
diagnostics buffer to a command that figures out which diagnostic it
was invoked on.
* lisp/progmodes/flymake.el
(flymake--diagnostics-buffer-mode-keymap): Renamed from
flymake--diagnostics-buffer-button-keymap.
(flymake-show-diagnostic-at-point): Don't take a button.
(flymake-goto-diagnostic-at-point): Don't pass button to
flymake-show-diagnostic-at-point.
(flymake--diagnostics-buffer-entries): Simplify.
The diagnostics buffer summarizes the diagnostics of a buffer in a
tabulated list and is permanently updated after each Flymake check.
* lisp/progmodes/flymake.el (flymake--handle-report): Call
flymake-show-diagnostics-buffer under certain conditions.
(flymake-menu, flymake--diagnostics-buffer-source)
(flymake--diagnostics-buffer-button-keymap)
(flymake-show-diagnostic-at-point)
(flymake-goto-diagnostic-at-point)
(flymake--diagnostics-buffer-entries)
(flymake-diagnostics-buffer-mode)
(flymake--diagnostics-buffer-name)
(flymake-show-diagnostics-buffer): New definitions.
* doc/misc/flymake.texi: Add a 'coding' cookie. Add a
@syncodeindex directive for @vindex. Use 2 spaces between
sentences. Lower-case @cindex entries.
(Overview of Flymake): Fix use of @itemize and @pxref. Fix
punctuation and markup.
(Backend exceptions): Use @emph instead of @dfn. Add more
indexing.
(Customizable variables, Extending Flymake): Improve wording.
(Flymake error types): Fix usage of @itemize. Improve wording.
(Backend functions): Fix punctuation. Fix markup. Add a
cross-reference to ELisp manual.
(Flymake utility functions): Add a cross-reference to ELisp manual.
(An annotated example backend): Fix punctuation and typos.
(Flymake mode, Running the syntax check)
(Navigating to error lines, Backend exceptions)
(Customizable variables, Flymake error types, Backend functions)
(Flymake utility functions, Proc customization variables)
(Locating a master file, Locating the buildfile)
(Starting the syntax check process, Parsing the output)
(Interaction with other modes): Fix indexing. Add index entries
for functions, variables, and concepts.
* lisp/progmodes/flymake.el (define-fringe-bitmap): Protect
against --without-x.
(flymake--mode-line-format): Ensure mode-line's mouse-4 and mouse-5 work
in their own windows.
Also, as a minor addition to this API, set flymake-text
on the diagnostic overlay. This enables a good example in
the section "Customization Flymake annotations".
* doc/misc/flymake.texi (Overview of Flymake)
(Syntax check statuses): Rework.
(Backend exceptions): Rename from "Troubleshooting"
(Customizable variables): Add flymake-start-on-flymake-mode. Rework.
(Extending Flymake): Write chapter.
(Customizing Flymake annotations, Flymake backends)
(Flymake utility functions, An annotated example backend):
New sections and subsections
* lisp/progmodes/flymake.el (flymake-diagnostic-functions)
(flymake-diagnostic-types-alist): Rework docstring.
(flymake--highlight-line): Set and use flymake-text property in overlay.
(flymake-goto-next-error, flymake-goto-prev-error): Fix funny quotes.
* src/sysdep.c (get_current_dir_name_or_unreachable):
Avoid integer overflow if working directory name is absurdly long.
When allocating memory for getcwd, do not exceed MAXPATHLEN.
* lisp/mail/rmailedit.el (rmail-cease-edit): If rmail-old-mime-state
is set, meaning that we are editing the raw message, do not
encode it again. Delete old body after, not before, inserting
new, to avoid moving marker at beginning of next message.
* lisp/progmodes/grep.el (grep-read-files): Clarify in the doc
string and in the prompt that shell wildcards can be used.
Suggested by Allen Li <vianchielfaura@gmail.com>. (Bug#28615)
* src/xdisp.c (redisplay_window): Clear the window's desired glyph
matrix before calling try_window with the same starting point.
This avoids assertion violations when switching from a buffer
without line numbers to a buffer with line numbers. (Bug28710)
Don't start the check immediately if the buffer is not being
displayed. Wait until it is, using window-configuration-change-hook.
This enables the user to batch-enable flymake-mode on many buffers and
not have that operation exhaust system resources for checking each
one. Likewise, an editing or save operation in a currently
non-displayed buffer does not immediately start a check.
* lisp/progmodes/flymake.el (flymake-start-on-flymake-mode):
Rename from flymake-start-syntax-check-on-find-file.
(flymake-start-syntax-check-on-find-file): Obsolete alias for
flymake-start-on-flymake-mode.
(flymake-start): Redesign. Affect the global post-command-hook
and local window-configuraiton-change-hook.
(flymake--schedule-timer-maybe)
(flymake-after-change-function, flymake-after-save-hook): Pass
t to flymake-start.
* test/lisp/progmodes/flymake-tests.el (flymake-tests--call-with-fixture)
(dummy-backends, recurrent-backend): Start flymake check
explicitly and immediately.
* doc/emacs/frames.texi (Scroll Bars): Describe how window
dividers can be used to replicate vertical borders when scroll
bars are disabled (Bug#27830).
* doc/emacs/frames.texi (Window Dividers): Mention their use
in replicating vertical borders.
See https://lists.gnu.org/archive/html/emacs-devel/2017-10/msg00151.html
and its resulting thread.
* lisp/display-line-numbers.el (display-line-numbers): Add to the
convenience group.
* lisp/faces.el (line-number):
(line-number-current-line): Add to the display-line-numbers group.
* src/sysdep.c (get_current_dir_name_or_unreachable):
New function, with most of the old contents of
emacs_get_current_dir_name.
(emacs_get_current_dir_name): Use it. Use a simpler
test for unreachable directory strings, and also apply
it to getcwd etc. (Bug#27871)
Provide a new option 'arabic-shaper-ZWNJ-handling' that controls how
to display ZWNJ in Arabic text rendering (Bug#28339).
* lisp/language/misc-lang.el: Register arabic-shape-gstring in
composition-function-table.
(arabic-shaper-ZWNJ-handling): New variable.
(arabic-shape-log): New variable.
(arabic-shape-gstring): New function.
* lisp/composite.el (lgstring-remove-glyph): New function.
* lisp/progmodes/python.el (python-prettify-symbols-alist): New
variable.
(python--prettify-symbols-alist): Make into obsolete alias for
`python-prettify-symbols-alist'.