[Usability] GtkEntry with units

["Robert Staudinger" <robert staudinger gmail com>]

Hi,

over at the abiword assembly line we're using a lot of GtkEntry
widgets for displaying the size of stuff like page width/height, table
cell size ...
There is no recommendation how to handle a size with units in the HIG.
Well there is [1], somewhat related but not quite.

So:
+ How to display a size with unit in a GtkEntry? Just append the unit
part? Put the unit part outside the GtkEntry like [1]?
+ How to edit a size with unit? This obviously depends on the previous
question. Should used units be changeable per GtkEntry? per App?
global Desktop setting like LC_NUMERIC? Should the unit be entered in
"plain text" or using a dropdown? How is the current unit displayed
while editing is in progress? Can it be overwritten?

[1] http://developer.gnome.org/projects/gup/hig/2.0/controls-entry.html#id2539896

Thanks for your time,
Rob