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bug#16438: 24.3.50; `C-x TAB right right' fails with error (mark-inactiv

From: Juri Linkov
Subject: bug#16438: 24.3.50; `C-x TAB right right' fails with error (mark-inactive)
Date: Tue, 14 Jan 2014 10:14:07 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (x86_64-pc-linux-gnu)

1. emacs -Q
2. Paste to *scratch*:

 '(mark-even-if-inactive nil))

3. Eval it.
4. Put point at its opening paren and type:

C-M-SPC    - selects the whole expression
C-x TAB    - activates a transient indentation mode
right      - adjusts indentation 1 position to the right
right      - fails with the error "The mark is not active now"
             because the previous `right' key deactivated the region

One way to fix this is not to deactivate the mark in this transient mode:

=== modified file 'lisp/indent.el'
--- lisp/indent.el      2014-01-13 05:03:31 +0000
+++ lisp/indent.el      2014-01-14 08:07:55 +0000
@@ -214,7 +214,9 @@ (defun indent-rigidly (start end arg &op
               (indent-to (max 0 (+ indent (prefix-numeric-value arg))) 0))
           (delete-region (point) (progn (skip-chars-forward " \t") (point))))
         (forward-line 1))
-      (move-marker end nil))))
+      (move-marker end nil)
+      (when (eq overriding-terminal-local-map indent-rigidly-map)
+       (setq deactivate-mark nil)))))

But the condition of checking for the transient mode doesn't work
because overriding-terminal-local-map never equals to indent-rigidly-map.

  (keymap (S-right . indent-rigidly-right-to-tab-stop) (S-left . 
indent-rigidly-left-to-tab-stop) (right . indent-rigidly-right) (left . 

  (keymap (keymap (S-right . indent-rigidly-right-to-tab-stop) (S-left . 
indent-rigidly-left-to-tab-stop) (right . indent-rigidly-right) (left . 

There is some `add-keymap-witness' at the end of `overriding-terminal-local-map'
when the transient indentation mode is active.  And I don't know another way
to check if `overriding-terminal-local-map' is active.

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