Bug#579084: gnome-icon-theme: missing preview of text files in nautilus

[Brian Marshall]

Okay, I made an attempt to figure out and fix this bug.

Nautilus uses the "text-x-preview" icon for text previews. To know where to
draw the text, it needs a "text-x-preview.icon" file in the same directory as
the icon image. This file has the coordinates of the box where the text is
drawn over the icon.

In gnome-icon-theme 2.28, the files were at
scalable/mimetypes/text-x-preview.svg and
scalable/mimetypes/text-x-preview.icon. There were text-x-preview.png icons
offered at sizes smaller than 48x48, but no .icon files for them. Yet, the
previews still displayed at those smaller sizes; I'm not sure why that is.

Anyway, in gnome-icon-theme 2.30, the scalable/mimetypes/ directory is gone,
and so is the only text-x-preview.icon file. Since I can't recreate the SVG
icon (and I assume it was removed for a reason), I chose to create a
text-x-preview.icon file for the 48x48 icon as a test (since that's the icon
size I use normally).

The first thing I noticed was the same thing I noticed originally when I filed
this bug report: the preview icon is shifted to the left a few pixels. I have
no idea why this is, but I can't see it as anything other than a bug, so I used
the GIMP to move it back to center.

Writing the .icon file was pretty easy. I just had to experiment with the
coordinates until the text fit snugly in the icon.

The end result is one modified file and one new one:
48x48/mimetypes/text-x-preview.png and 48x48/mimetypes/text-x-preview.icon.
Those two files are attached.

This only works for the 48x48 icon size, obviously, so it's still incomplete.
I'm not even sure if this is the right way to go about it. Any additional help
would be very appreciated. Does this affect upstream?

Brian
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