Bug#885064: No thumbnails for images under Nautilus

[Dan]

Package: Nautilus
Version: 3.26.2-1

When I open a folder containing some jpg or png images in Nautilus, none of
image thumbnails are generated.
I can see thumbnails for those images all fail under
.cache/thumbnails/fail/gnome-thumbnail-factory/

hexdump -C
~/.cache/thumbnails/fail/gnome-thumbnail-factory/49be632c0fdb9c6cf68be6e3b324e0da.png
00000000  89 50 4e 47 0d 0a 1a 0a  00 00 00 0d 49 48 44 52
|.PNG........IHDR|
00000010  00 00 00 01 00 00 00 01  08 06 00 00 00 1f 15 c4
|................|
00000020  89 00 00 00 04 73 42 49  54 08 08 08 08 7c 08 64
|.....sBIT....|.d|
00000030  88 00 00 00 53 74 45 58  74 54 68 75 6d 62 3a 3a
|....StEXtThumb::|
00000040  55 52 49 00 66 69 6c 65  3a 2f 2f 2f 68 6f 6d 65
|URI.file:///home|
00000050  2f 64 61 6e 7a 2f 50 69  63 74 75 72 65 73 2f 53
|/danz/Pictures/S|
00000060  63 72 65 65 6e 73 68 6f  74 25 32 30 66 72 6f 6d
|creenshot%20from|
00000070  25 32 30 32 30 31 37 2d  31 32 2d 32 33 25 32 30
|%202017-12-23%20|
00000080  32 32 2d 32 38 2d 33 34  2e 70 6e 67 32 12 bf 2e
|22-28-34.png2...|
00000090  00 00 00 17 74 45 58 74  54 68 75 6d 62 3a 3a 4d
|....tEXtThumb::M|
000000a0  54 69 6d 65 00 31 35 31  34 30 32 31 33 31 35 aa
|Time.1514021315.|
000000b0  2c 28 b9 00 00 00 20 74  45 58 74 53 6f 66 74 77  |,(....
tEXtSoftw|
000000c0  61 72 65 00 47 4e 4f 4d  45 3a 3a 54 68 75 6d 62
|are.GNOME::Thumb|
000000d0  6e 61 69 6c 46 61 63 74  6f 72 79 6f 44 55 e0 00
|nailFactoryoDU..|
000000e0  00 00 0b 49 44 41 54 08  99 63 60 00 02 00 00 05
|...IDAT..c`.....|
000000f0  00 01 62 55 32 88 00 00  00 00 49 45 4e 44 ae 42
|..bU2.....IEND.B|
00000100  60 82                                             |`.|
00000102

I am not 100% sure it is an issue with Nautilus, but it occurs in Nautilus
under Gnome 3, Gnome 3 flashback and Xfce.
On the other hand, Xfce's file manager thunar can generate thumbnails
without any problems. If I open a folder with thunar to generate thumbnails
first and then open the same folder
with Nautilus, all thumbnails would be displayed fine. Also I can confirm I
can generate thumbnails for images using gdk-pixbuf-thumbnailer.
This feature worked for me before. It possibly got broken 2 or 3 months ago
since gnome-3.26 roll-out.

When thumbnailing fails, I don't see any errors in either
~/.xsession-errors or /var/log/messages.
It could be an issue with gnome-thumbnail-factory settings but I don't know
how it works and I am not sure where I need to look.

I am using Debian GNU/Linux buster/sid,
Linux 4.14.0-1-686-pae #1 SMP Debian 4.14.2-1 (2017-11-30) i686 GNU/Linux
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