[Bug 89635] selection moves some lines up by a pixel

[Bogdan Butnaru]

Public bug reported:

Binary package hint: firefox

This is on Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.2)
Gecko/20061201 Firefox/2.0.0.2 (Ubuntu-feisty) --- exactly what the
Feisty repositories gave me. apt-get calls it version
2.0.0.2+1-0ubuntu1.

Quite recently --- one or two updates ago, I think --- I noticed that in
some places, selection moves characters around. As a simple example, go
to http://en.wikipedia.org/wiki/Dns (you'll be redirected, that's OK).
You'll get to the disambiguation page.

Put your mouse cursor on the "Did not start" line, press the left button
and select up to the middle of the great "(disambiguation)" sign on top
of the page. What should happen is that when they are selected, the
first line starting from the "- Internet sys..." up to its end, and the
entire "(Redirected from Dns)" line, will get translated upwards by a
pixel.

If you deselect by just clicking on a blank space, the text is restored.
If you started a selection but didn't release the button, and you
"uncover" a selected line that has the bug, sometimes it's left moved by
a pixel, sometimes it's normal.

The funny thing is that the bug in canceled (the text is drawn
correctly) the moment the window looses focus. For some reason, this
means that you can't screenshot the bug. It's fixed right before taking
the screenshot...

I could send photos if you can't reproduce, but it's kind of hard to
see.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
selection moves some lines up by a pixel
https://launchpad.net/bugs/89635