bug#6100: c-beginning-of-defun doesn't push mark

[Stefan Monnier <monnier@iro.umontreal.ca>]

> There is one annoying difference between `beginning-of-defun'
> and `c-beginning-of-defun':

> `beginning-of-defun' and `end-of-defun' pushes the mark for the
> old point location to the mark ring with this code:

>   (or (not (eq this-command 'beginning-of-defun))
>       (eq last-command 'beginning-of-defun)
>       (and transient-mark-mode mark-active)
>       (push-mark))

> but `c-beginning-of-defun' doesn't do that.

> This patch add the same code to `c-beginning-of-defun' and `c-end-of-defun':

Of course, I'd argue that the right fix is to use `beginning-of-defun'.


        Stefan