User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.8a6) Gecko/20050118 Build Identifier: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.8a6) Gecko/20050118 When the middle mouse button is clicked in the scrollbar window of the mail composer window, the primary selection is copied into the mail text window at the position where the button clock occurs. Reproducible: Always Steps to Reproduce: 1.Open a mail compose window, best by reply to another mail 2. The mail contents appears in the composer and the window scrolls down to the bottom of the text 3. Move the cursor to the top of the scrollbar window and click the middle mouse button Actual Results: The window scrolls to the top of the text. This is the expected behaviour. The primary selection appears in the mail window, this should not happen. Expected Results: Only the window should be scrolled, but the selection should not be copied. Tested with mozilla-1.8a6, but the problem appears also in all previous versions.

Isn't it normal behaviour that in X the middle mouseclick pastes text?

Whether to paste text depends on the window, the mouse click occurs in. It is the normal behaviour in the text input window, but not, if the middle butten is clicked in the scrollbar window. In the scrollbar window the scrollbar and the associated scrolled window should be positioned to the cursor position, but not text should be copied.

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*** This bug has been marked as a duplicate of 70698 ***