[krita] [Bug 493474] New: Thumbnail and QuickLook previews not displaying on macOS 15 Sequoia

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=493474

            Bug ID: 493474
           Summary: Thumbnail and QuickLook previews not displaying on
                    macOS 15 Sequoia
    Classification: Applications
           Product: krita
           Version: 5.2.3
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: File formats
          Assignee: krita-bugs-null at kde.org
          Reporter: omnibus.cheeked-0q at icloud.com
  Target Milestone: ---

Created attachment 173959
  --> https://bugs.kde.org/attachment.cgi?id=173959&action=edit
Contains KritaUsageLog.txt, KritaSystemInformation.txt, Test.kra and
screenshots of the aforementioned issue.

SUMMARY
Apple removed support for deprecated Quick Look Generator plugins
(kritaquicklook.qlgenerator) from macOS 15 Sequoia, leading to empty thumbnails
for .kra files and broken QuickLook previewing. Please migrate to Quick Look
Preview Extension and Thumbnail Extension API. Documentation for developers can
be found below.
Forum discussion:
https://krita-artists.org/t/icon-thumbnails-not-displaying-on-mac-desktop/102375
macOS Sequoia 15 Release Notes:
https://developer.apple.com/documentation/macos-release-notes/macos-15-release-notes#Quick-Look
Apple Developer Documentation Providing Thumbnails of Your Custom File Types:
https://developer.apple.com/documentation/quicklookthumbnailing/providing-thumbnails-of-your-custom-file-types
Apple Developer Documentation QuickLook Thumbnailing:
https://developer.apple.com/documentation/quicklookthumbnailing
Apple Developer Documentation QuickLookUI:
https://developer.apple.com/documentation/QuickLookUI
Apple Developer Documentation QuickLook:
https://developer.apple.com/documentation/quicklook

STEPS TO REPRODUCE
1. Install Krita via DMG or Homebrew on macOS 15 Sequoia.
2. Open Krita and save an image in .kra format.
3. Open Finder and find the newly saved .kra file.
OR
1. Upgrade from macOS 14 Sonoma to macOS 15 Sequoia with Krita and .kra files
already on macOS 14 Sonoma.
2. Open Finder and find existing .kra files.

OBSERVED RESULT
Thumbnails are not displayed for .kra files. QuickLook preview does not work.

EXPECTED RESULT
Thumbnails should be displayed for .kra files. QuickLook preview should work.

SOFTWARE/OS VERSIONS
Windows: 
macOS: macOS 15.0 Sequoia
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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