[Digikam-devel] [digikam] [Bug 359087] New: Preview image scroll position should be smarter when changing between images with different resolutions

[Michal Sylwester via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=359087

            Bug ID: 359087
           Summary: Preview image scroll position should be smarter when
                    changing between images with different resolutions
           Product: digikam
           Version: 5.0.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Preview
          Assignee: digikam-devel at kde.org
          Reporter: msylwester at gmail.com

When watching images zoomed in it is currently possible to switch to different
image and the are shown is preserved (this is convenient as a quick alternative
to the light table). The problem occurs when the images have different
resolutions. 
- With a same image in different resolutions different area will be shown
- While switching back and forth between images where one is lower resolution
the position will be capped to the maximum of the smallest image. Happens when
I cropped one image, and accidentally select it while working on another one.

Reproducible: Always

Steps to Reproduce:
Scenario 1:
1. Make sure there are 2 versions of image, high and low resolution 
2. Preview one of them
3. Switch to the other

Scenario 2:
1. Make sure one of the images in thummbar has significantly lower resolution 
2. Preview high-resolution image (preferabelly in lower right corner)
3. Switch to low-resolution image
4. Switch back to high resolution image


Actual Results:  
Scenario 1: Area further up and left from originally selected is visible
Scenario 2: Different area of the image is visible

Expected Results:  
Scenario 1: Same area as originally selected is visible
Scenario 2: Same area of both images is visible (here is the additional issue
of whether and how zoom should be adjusted)

I think this may be a little tricky to make it work the way I would like,
especially as it would most likely also require considerations about zoom level
- should it change? Most of the time I don't care that much about actual zoom
relative to "100%", more to the relative visible area of an image, so it would
mean it should also change...

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