[digikam] [Bug 441648] New: preview of next/previous HEIF (iPhone) image is very slow

[rfeg]

https://bugs.kde.org/show_bug.cgi?id=441648

            Bug ID: 441648
           Summary: preview of next/previous HEIF (iPhone) image is very
                    slow
           Product: digikam
           Version: 7.3.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Keywords: efficiency, reproducible, usability
          Severity: normal
          Priority: NOR
         Component: Preview-Image
          Assignee: digikam-bugs-null at kde.org
          Reporter: rfeg.art at gmail.com
  Target Milestone: ---

SUMMARY

STEPS TO REPRODUCE:
1. import iPhone photos to album
2. double-click on thumb
3. when image is opened hit -> or <- key
4. measure time to show next image

OBSERVED RESULT: takes about to show next picture after hitting -> or <- keys

EXPECTED RESULT: should take less than one second like JPEG and RAW files (it
is very fast)

SOFTWARE/OS VERSIONS: macOS with M1 (using Rosetta) 

ADDITIONAL INFORMATION: if you press -> several times the files strip moves
several times but big image is still the same until finally shows image
selected (that is not visible in the film strip); 
it seems that is not a Mac/M1 related thing, since other images show very fast. 
It occurs also in version 7.2.0.
Note: this is my first bug submission, sorry for any missing info, please be
kind

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