Grub2 theme bug with relative numeric values for boot_menu?

[John Hupp <grub-dev@prpcompany.com>]

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I'm trying to make my theme completely resolution-independent.  You can 
see a current screen shot at Post your Grub 2 Themes 
<http://ubuntuforums.org/showthread.php?t=1823915&page=14&p=13031738#post13031738>

Grub responded well to % values for the numeric values in the progress 
bar and labels.  Also OK with %'s for boot_menu properties top, left, 
height, width.

But I'm getting bad behavior with item_height and the other properties.  
For a 1024x768 grub display and an original setting of item_height = 26, 
I can't get equivalent output unless I set item_height = 27%

So item_height seems to be referencing a parent with a height of about 
96, rather than 768.

This is in a VMWare Player environment running Lubuntu 14.04.

Is this a known problem, or is there an explanation/workaround?

(I also realized as I got into this that I will run into a problem with 
different aspect ratios, so other than creating at least two themes for 
the commonest aspect ratios, I'd be interested in a tip there as well if 
there is a solution.)

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