thumbnail: Add x-large and xx-large thumbnail spec size

Rather than adding hi-dpi specific text to the thumbnail specification, we expect code that calls out to thumbnailers to automatically ask for the right size of thumbnail to be displayed, depending on the level of integration that the toolkit provides.

The x-large "512x512" size could be used as a 512x512 size for non-hi-dpi displays, or equivalent to a 256x256 logical size of displays with a 2x DPI.

The "x*-large" name also has the benefit of being easily extensible without getting a thesaurus out.

Closes: #15 (closed)

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• 01dac684...cead5dc4 - 3 commits from branch master
• 0596c854 - thumbnail: Add x-large and xx-large thumbnail spec size

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mentioned in merge request !35 (closed)

GNOME implementation: https://gitlab.gnome.org/GNOME/gnome-desktop/-/merge_requests/99

added 1 commit

• 9e938b61 - thumbnail: Add x-large and xx-large thumbnail spec size

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resolved all threads

added 1 commit

• e880c4f4 - thumbnails: Fix a number of typos

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resolved all threads

added 2 commits

• dbffd26e - thumbnails: Fix a number of typos
• fb6852d9 - thumbnail: Add x-large and xx-large thumbnail spec size

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This looks good to me @faure @StefanBruens ?

At least with xxx-large you are very prone to hit some spam filters ;-)

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• 47258f22 - web-export: Export the new version of the thumbnail spec

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merged