bug#20408: 24.5; How to escape the transient region when C-x TAB'ing?

[Sebastien Vauban]

Hello,

When using C-x TAB, I can't escape from the transient mode as described
in the help:

  ┌────
  │ `C-x <TAB>'
  │      This command is used to change the indentation of all lines that
  │      begin in the region, moving the affected lines as a "rigid" unit.
  │ 
  │      If called with no argument, the command activates a transient mode
  │      for adjusting the indentation of the affected lines interactively.
  │      While this transient mode is active, typing <LEFT> or <RIGHT>
  │      indents leftward and rightward, respectively, by one space.  You
  │      can also type `S-<LEFT>' or `S-<RIGHT>' to indent leftward or
  │      rightward to the next tab stop (*note Tab Stops::).  Typing any
  │      other key disables the transient mode, and resumes normal editing.
  └────

If I type a letter, it replaces the region.

That must come from my setting:

  ┌────
  │ (delete-selection-mode 1)             ; Overwrite region.
  └────

Then, how do we escape in such a case?

- C-g does not seem right -- even if it works.
- M-w is what I do, but that has a side effect...

Any other adviced way?

Should the above be mentioned in the doc?

In GNU Emacs 24.5.1 (i686-pc-mingw32) of 2015-04-11 on LEG570

Best regards,
  Seb

-- 
Sebastien Vauban