I used to have thumbnails for text files in Nautilus but I don't have them anymore. I'm on Ubuntu 12.10, I haven't disabled them as per How to stop Nautilus from creating thumbnails of specific file types? and they are displayed for other file types like pdf and videos.
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Do you mean something like this? – Lucio Apr 05 '13 at 00:00
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Exactly. Exactly. – sup Apr 05 '13 at 00:01
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This is a bug. As all the icons in question were all in a Ubuntu One synchronized folder, the live text preview (which works differently for text files and for other filetypes, hence the inability of scripts to regenerate thumbnails to make thumbnails of text files) does not work because Ubuntu one uses emblems and they break the live text preview.

sup
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To have an icon with a preview text for all the text files, follow this steps:
- Open the Preferences menu in the Edit tab
- Click the Preview tab
- Now you will see that the first option is "Show text in icons", choice it and select Always
Result:

Lucio
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1In this case you should check exactly the configurations that you made using
dconf
and try to disable and revert it. – Lucio Apr 05 '13 at 00:04 -
Hm, I am fiddling with it but with no succes. There do not seem to be so many options related to it. But it works with a guest account so I guess I will try some form of bisection. Thanks for the pointers! – sup Apr 05 '13 at 00:09
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1Renaming my
.config/dconf
resets my settings but does not bring thumbnails. I tried to use James Henstridge's script from http://askubuntu.com/questions/199110/how-can-i-instruct-nautilus-to-pre-generate-thumbnails?rq=1 but it complains it cannot preview text/plain, which puzzles me deeply. – sup Apr 05 '13 at 00:47 -