From: http://bugzilla.gnome.org/show_bug.cgi?id=335496#c1
The thumbnailing code determines the thumbnail "freshness" based on the file
mtime. chmod doesn't change the mtime, but touch does.
It isn't worth the added complexity to track the ctime too (which changes when
permissions are changed). We use GnomeThumbnail (from libgnomeui), which relies
on mtime.
This is a deliberate design choice, so I'm marking it as "NOTABUG".
** Changed in: gthumb (Ubuntu)
Status: Confirmed => Rejected
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gthumb doesn't re-scan thumbnails when permissions change
https://launchpad.net/bugs/33494
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