I think I figured this out. libnux does some elaborate adjustments to
texture coordinates to make sure texels are always sampled at the
midpoint, for clean nearest sampling, but this is wrong: the fragment
sampling grid already ensures that! So the elaborate adjustment does the
opposite: the sampling positions are moved to the boundaries between the
texels, and that is why we're seeing this flaky behavior with different
hardware.

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https://bugs.launchpad.net/bugs/927441

Title:
  Far left character in panel (and launcher popups) distorted

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