bug#27530: patch to cut and copy secondary

[Robert Pluim <rpluim@gmail.com>]

Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:

>>> The function `mouse-exchange-point-and-mark-secondary' exchanges `mark
>>> and point' and secondary.  When there is neither primary nor
>>> secondary, it behaves as `exchange-point-and-mark'.  By doing this, no
>>> revision is necessary for functions that react to region.
>> 
>> This description seems to contradict the docstring:
>>>  
>>> +(defun mouse-exchange-point-and-mark-secondary (&optional arg)
>>> +  "Exchange the point and the mark, and the secondary selection.
>>> +When the mark is active, this exchanges the point and the mark
>>> +then creates the secondary selection from the primary selection.
>>> +When the mark is not active but the secondary selection exists,
>>> +this restores the primary selection from the secondary selection."
>>         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> 
>> Could you explain in more detail how this functions? The behaviour
>> seems useful, but I don't understand exactly what it does just from
>> the docstring.
>
> The function exchanges point and mark.
> When there is region, this also creates secondary.
> When there is secondary, this converts secondary to primary in advance.
>

OK. So if I've understood correctly, the user can then use C-y to yank
the primary (which was the secondary before)?

Regards

Robert