bug#18939: 24.4; middle-click sometimes pastes data other than the PRIMARY selection

[Vincent Lefevre]

This occurs very often, and I've finally managed to find a way to
reproduce the bug:

1. Open a file containing a line, say "foo", with "emacs -Q".

2. When the cursor is at the beginning, type C-k.

3. Select text in some other window.

4. Left-click in the initial Emacs window.

5. Middle-click in the initial Emacs window.

Instead of pasting the selected text, this pastes what was cut
with C-k.

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)