[digikam] [Bug 375700] New: Digikam freezes for a long time (I/O wait) if similarity range is set too low

[Jens]

https://bugs.kde.org/show_bug.cgi?id=375700

            Bug ID: 375700
           Summary: Digikam freezes for a long time (I/O wait) if
                    similarity range is set too low
           Product: digikam
           Version: 5.5.0
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Searches-Fuzzy
          Assignee: digikam-devel at kde.org
          Reporter: jens-bugs.kde.org at spamfreemail.de
  Target Milestone: ---

I have roughly 160GB of photos on my SSD disk on an Intel Haswell i5-4570 with
8G RAM (so enough horsepower). However, when I select an image and search for
similar images using similarity search, and then set the similarity starting at
20% (up to 100%), the application freezes for almost a minute.

While this might be technically correct behaviour, the user experience here is
really bad. Please add a progress bar (if possible) and a "Cancel search"
button. Maybe it is possible to perform this search in the background
altogether (so you can return to the results later on)?
Also, a warning maybe for similarities below 30% that they might take a long
time to match would be helpful.

Thank you!

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