[kio] [Bug 329773] New: Thumbnail of picture in dolphin never updated after picture manipulation if file's modification time kept

[Nicofo]

https://bugs.kde.org/show_bug.cgi?id=329773

            Bug ID: 329773
           Summary: Thumbnail of picture in dolphin never updated after
                    picture manipulation if file's modification time kept
    Classification: Unclassified
           Product: kio
           Version: 4.11.5
          Platform: Fedora RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: thumbnail
          Assignee: unassigned-bugs at kde.org
          Reporter: nicofo at tuxfamily.org
                CC: caulier.gilles at gmail.com, frank78ac at googlemail.com

+++ This bug was initially created as a clone of Bug #329608 (that bug was for
the digikam part) +++

The thumbnail of pictures are not updated after picture manipulation outside
dolphin if the file's modification time is kept (for instance rotation in
digikam).

Reproducible: Always

Steps to Reproduce:
1. In dolphin, activate the preview mode in a directory containing pictures
2. Modify a picture and ensure the file's modification time is not updated (I
use digikam to rotate a picture)
3. Go back to dolphin -> the picture thumbnail is never refreshed (even after
F5). However the preview in the information panel is correct ->  see attachment
below [the preview in the right is correct ; the thumbnail in the left is not].
-> attachment 84456 : https://bugs.kde.org/attachment.cgi?id=84456

If I rename or move the picture -> the thumbnail is recreated and is correct.
If I re-rename the file to its original name -> the thumbnail is incorrect
again.
If I "touch" (command line) the picture -> the thumbnail is recreated and is
correct.

Remark:
There is no problem if the file's modification time is updated.
However, manipulate a picture and not touch to the file's modification time is
a common use case (especially for pictures if you want to preserve pictures
order for instance) and must be taken into account.

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