[digikam] [Bug 446466] New: Pictures on NFS share with special characters in their album name don't show icon/image previews

[stef]

https://bugs.kde.org/show_bug.cgi?id=446466

            Bug ID: 446466
           Summary: Pictures on NFS share with special characters in their
                    album name don't show icon/image previews
           Product: digikam
           Version: 7.3.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Albums-IconView
          Assignee: digikam-bugs-null at kde.org
          Reporter: kdebugs at meissner.click
  Target Milestone: ---

Created attachment 144205
  --> https://bugs.kde.org/attachment.cgi?id=144205&action=edit
Screenshots illustrating the bug reported

SUMMARY
Icon and image preview are broken for albums on a nfs share containing special
characters as German umlauts (e.g. ä, ü). See screenshots in the attachment.

STEPS TO REPRODUCE
1. In a network share collection (NFS mount), I create an album with the name
Test_ä or Test_ü
2. I add some pictures/movies to new album using drag-and-drop from MacOS
Finder to digikam (not relevant how this is done though)
3. In digikam's album view, I check the icon area and the image preview area
for the added pictures/movies 

OBSERVED RESULT
The green placeholder icons are show for the added images/movies only and in
the preview area it says "Failed to load image"

EXPECTED RESULT
Regular icons and an image preview reflecting the added pictures/movies content
are shown

SOFTWARE/OS VERSIONS
digikam version 7.3.0
CPU cores: 8
DNG SDK: 1.5.1
Eigen: 3.3.9
ExifTool: 12.34
Exiv2 supports Base Media: Yes
Exiv2 supports XMP metadata: Yes
HEIF encoding support: Yes
ImageMagick codecs: 6.9.11
KF5: 5.80.0
LensFun: 0.3.95-0
LibCImg: 130
LibJPEG: 80
LibJasper: 2.0.14
LibLCMS: 2120
LibLqr support: No
LibPGF: 7.21.07
LibPNG: 1.6.37
LibRaw: 0.21.0
LibTIFF: 4.2.0
Marble: 0.27.20
Parallelized demosaicing: Yes
Qt: 5.15.2
Qt WebEngine support: Yes
Rajce support: Yes
VKontakte support: No
XMP SDK: 5.6.0
AkonadiContact support: No
Baloo support: No
Calendar support: Yes
DBus support: No
Database backend: QSQLITE
HTML Gallery support: Yes
LibAVCodec: 58.91.100
LibAVFormat: 58.45.100
LibAVUtil: 56.51.100
LibGphoto2: 2.5.27
LibOpenCV: 4.5.1
LibQtAV: 1.13.0
Media player support: Yes
Panorama support: Yes

ADDITIONAL INFORMATION
- Moving the folder Test_ä to a local collection makes the issue disappear;
moving it back to the nfs share als brings the issue back
- Renaming the folder to not contain the umlaut character solves the problem;
when the umlaut is added again, the issue is also back
- mount statement used for the nfs share is: nas:/photo on /Volumes/photo (nfs,
nodev, nosuid, mounted by stefan)
- Checking the mounted nfs share within a console shows regular file names
incl. special characters

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