Preliminary attempt to fix horizontal scroll bar dragging with bidi text.

* w32term.c (w32_horizontal_scroll_bar_handle_click): In y part
of emacs_event return length from si.nPage to si.nMax.
* xdisp.c (set_horizontal_scroll_bar): For right-to-left text
interchange start and end of thumb.
* scroll-bar.el (scroll-bar-horizontal-drag-1): Use cdr of
portion-whole for scrolling right-to-left text.
* xdisp.c (set_horizontal_scroll_bar): Don't use uninitialized local.
Add dependencies to fix loaddefs race during parallel builds.

Without this, for example, 'make -j bootstrap' can fail and report
"Opening input file: no such file or directory,
.../lisp/calendar/diary-loaddefs.el ... recipe for target
'calendar/hol-loaddefs.el' failed", where the hol-loaddefs.el rule
got confused because diary-loaddefs.el was being built in parallel.
* Makefile.in ($(CAL_DIR)/diary-loaddefs.el):
Depend on $(CAL_DIR)/cal-loaddefs.el.
($(CAL_DIR)/hol-loaddefs.el): Depend on $(CAL_DIR)/diary-loaddefs.el.
Handle missing space marker in unified diff during header fixup

* vc/diff-mode.el (diff-fixup-modifs): Handle empty line in
context of unified diff.
Fix bug #18277 with mouse clicks on R2L lines.

 src/dispnew.c (buffer_posn_from_coords): Fix mirroring of X
 coordinate for hscrolled R2L screen lines.
Avoid inflooping in redisplay caused by hscrolled R2L lines.

 src/xdisp.c (display_line): Don't assume that the call to
 reseat_at_next_visible_line_start ends up at a character
 immediately following the newline on the previous line.  Avoids
 setting the ends_at_zv_p flag on screen lines that are not at or
 beyond ZV, which causes infloop in redisplay.  For the details, see
 http://lists.gnu.org/archive/html/emacs-devel/2014-08/msg00368.html.
Avoid overwriting the reversed_p flags in the glyph matrices.

 Avoid overwriting the reversed_p flags in the glyph matrices when
 init_iterator or start_display are called.

 src/xdisp.c (init_iterator): Don't initialize the reversed_p flag of
 the glyph row here.
 (tool_bar_height, redisplay_tool_bar, try_window)
 (try_window_reusing_current_matrix, try_window_id)
 (get_overlay_arrow_glyph_row, display_menu_bar): Initialize the
 reversed_p flag of the iterator's glyph row where the glyph row
 is going to be redrawn.
Fix horizontal scrolling in non-selected windows.

 lisp/scroll-bar.el (scroll-bar-horizontal-drag-1)
 (scroll-bar-toolkit-horizontal-scroll): When determining the
 paragraph direction, use the buffer of the window designated in
 the event.
* lisp/simple.el (self-insert-uses-region-functions): Defvar.
Fix bug #18276 with vertical motion through a display property.

 src/indent.c (Fvertical_motion): Fix vertical motion up through a
 display property after a newline.
src/xdisp.c (handle_stop): Improve commentary.
* lisp/progmodes/python.el (python-shell-prompt-detect): Remove redundant
executable-find.
* python-tests.el (python-shell-calculate-exec-path-2): Update test
for today's python.el changes.
* lisp/emacs-lisp/eldoc.el (eldoc-highlight-function-argument): Add support
for &key args.
* emacs-lisp/eldoc.el (eldoc-argument-case): Obsolete and change default.
(eldoc-function-argstring-format): Remove.
(eldoc-function-argstring): Always return upcase args.
Use help-make-usage.  Don't add parens.
(eldoc-get-fnsym-args-string): Don't obey eldoc-argument-case since
it's too late to do it right (bug#18048).
* xdisp.c (erase_phys_cursor): Fix confusion between window-relative
and text area-relative x-coordinates.
Fix horizontal scroll bar dragging in R2L paragraphs.

 src/w32term.c (w32_horizontal_scroll_bar_handle_click): Fix the
 second coordinate ('y') reported for dragging the horizontal
 scroll bar thumb.
Update Emacs's bidirectional conformance per Unicode 6.3.0.

 doc/lispref/display.texi (Bidirectional Display): Update the Emacs's class
 of bidirectional conformance.
Remove 16-bit limitations in scroll bar position reporting on MS-Windows.

 src/w32term.c (w32_scroll_bar_handle_click)
 (w32_horizontal_scroll_bar_handle_click)
 (x_scroll_bar_report_motion)
 (x_horizontal_scroll_bar_report_motion): For SB_THUMBPOSITION and
 SB_THUMBTRACK, use the 32-bit position information returned by
 GetScrollInfo, not the 16-bit information returned in the Windows
 message sent to us.
Extract python-new-pythonpath to handle PYTHONPATH in user code

* lisp/progmodes/python.el (python-new-pythonpath): Extract from
`python-shell-calculate-process-environment'.
ChangeLog fix

Ref: http://lists.gnu.org/archive/html/emacs-devel/2014-01/msg01038.html