Graphical glitch when tint is enabled

[Henk Boom]

Hi, I've noticed that when urxvt is resized to a width or height that
is not an integer number of textual rows/columns, and
transparency/tinting is enabled, the bottom and right sides of the
window (the "dead regions" which contain no text) do not render
properly. This happens when I maximize the window in fluxbox (0.9.14)
or when I use maximize or full-screen in the latest xfce.

Here are a couple of screenshots illustrating the problem.

First, urxvt in the lower right of the screen, to show that it's not a
problem with the background:
http://lunarcrisis.pooq.com/files/urxvt1.jpeg

Now, the graphical glitch, notice how there is a bar along the bottom
and right sides:
http://lunarcrisis.pooq.com/files/urxvt2.jpeg

This only happens when tint is enabled though, so while "urxvt -tr"
works properly, "urxvt -tr -tint white" does not.

As far as I can tell, this is still an issue in CVS HEAD. I have a few
years of programming experience, but I am having trouble finding my
way around the urxvt code to find the problem. What part of the code
deals with tinting? Is that what's likely to be causing the problem?

        Henk Boom