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functions so they don't do work that the default one can do instead

to vc-hooks.el so it will be available to other modes, such as
speedbar.el.  Also, teach it to recognize monotine state directories.

* speedbar.el: Remove this mode's fragile assumptions about
version-control systems.  Instead, make it use logic from
vc-hooks.el so it will become smarter whenever VC mode does.

* vc-hooks.el: 'added is a real state, not a future hypothetical
one. Fix the documentation.

Modify all instances of the dir-state back-end method to suppress
keeping undo lists on the buffers holding astatus output, which
csn get extremely large.

with thumbs-conversion-program instead of through shell-file-name
for better error reporting when program is missing.

non-terse mode.
(vc-dired-ignorable-p): Ignore Makefile when it has a peer named
Makefile.in or Makefile.am

use completion-ignored-extensions to detect files that should be
ignorted in VC-Dired listings, heading off lots of expensive calls
to (vc-state).

machinery in place to support editing of change comments
with 'e' in a log-view buffer.  Not documented yet as this
only works for SCCS, RCS, and maybe CVS if you have admin
privileges.  When we have backend support for Subversion and
more modern systems it will ve time to write this up.

buffer is modfied, cancel the writing.

buffer is always restored.

(math-compose-var): Handle variables with percent signs.
(math-compose-expr): Handle function names with percent signs.

(math-read-exprs): Handle percent signs in languages that allow them.
(math-restore-underscores): Remove function.
(math-remove-percentsigns,math-restore-placeholders): New functions.

	* image-mode.el (image-bookmark-make-cell, image-bookmark-jump):
	New functions.
	(image-mode): Set bookmark-make-cell-function appropriately.

	* doc-view.el (doc-view-bookmark-jump): Correct misspelled arg
	name.

	* bookmark.el (bookmark-make-cell-function): New variable.
	(bookmark-make): Call bookmark-make-cell-function's function
	instead of bookmark-make-cell.
	(bookmark-get-handler, bookmark-jump-internal): New functions.
	(bookmark-jump, bookmark-jump-other-window, bookmark-insert)
	(bookmark-bmenu-2-window, bookmark-bmenu-other-window): Use
	bookmark-jump-internal.
	(bookmark-make-cell-for-text-file): Renamed from
	bookmark-make-cell.

	* doc-view.el (doc-view-bookmark-make-cell)
	(doc-view-bookmark-jump): New functions.
	(doc-view-mode): Set bookmark-make-cell-function buffer-locally.

(allout-write-file-hook-handler): Simplify code.

(ps-print-preprint-region): Use (mark) for the error check.