Re: mouse-yank-primary and bug #7699

[Jan Djärv]

Eli Zaretskii skrev 2010-12-21 20.29:
> I have a question for experts on X selections.
>
> I think I can fix bug#7699 if I switch the order of calling
> x-get-selection-value and x-get-selection in this snippet from
> mouse-yank-primary:
>
>    (let ((primary
>          (cond
>           ((fboundp 'x-get-selection-value) ; MS-DOS, MS-Windows and X.
>            (or (x-get-selection-value)
>                (x-get-selection 'PRIMARY)))
>
> My question is: could switching the order do the wrong thing on X?  I
> looked into x-get-selection-value and x-get-selection as they are
> implemented on X, and they seem to do very similar things, but I don't
> know enough to understand the semantics of the subtle differences.
>
> If switching the order is not TRT on X, I could do that only for w32.

x-get-selection-value tries UTF8-STRING first, the COMPOUND_STRING and finally 
STRING (unless overridden by the user).  x-get-selection as called above only 
does STRING.  So for all cases when the selection isn't a latin-1 string, 
switching would most likely do the wrong thing.  There was a bug report about 
this (6802).  We can't rely on applications not sending STRING when the data 
isn't in latin-1.

        Jan D.