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Re: mouse-yank-primary and bug #7699

From: Jan Djärv
Subject: Re: mouse-yank-primary and bug #7699
Date: Wed, 22 Dec 2010 07:47:42 +0100
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; sv-SE; rv: Gecko/20101129 Thunderbird/3.1.7

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

   (let ((primary
          ((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.

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