https://bugs.kde.org/show_bug.cgi?id=433959

            Bug ID: 433959
           Summary: Single horizontal line when 100% zooming and scrolling
                    down (when using 200% scaling on X)
           Product: Spectacle
           Version: 20.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: m...@baloneygeek.com
          Reporter: pos...@posteo.eu
                CC: k...@david-redondo.de
  Target Milestone: ---

Created attachment 136371
  --> https://bugs.kde.org/attachment.cgi?id=136371&action=edit
Screenrecording

SUMMARY

I created a native resolution screenshot of a website which resulted in a
3812x6948 image and viewed it Gwenview.

When I set the zoom to 100% and scrolled down, in the lower quarter of the
image a horizontal line appeared. Please see the screen recording.
If I moved Gwenview's window to the secondary monitor, I could not reproduce
this issue.

Finally I repeated the steps with a screenshot on the secondary monitor, which
resulted in an image with 2532x7636 pixel. Here I could reproduce it on the
secondary monitor, though the line appeared at the top just below the
navigation of the screenshotted Wikipedia article.
With this picture I could also reproduce it when I moved Gwenview's window to
the primary monitor and zoomed out and back in to 100%, though the line
appeared at a slightly different position now.

The line could be removed by refreshing the image via F5. The line did not
appear when the zoom mode "filled" was used. This issue is independent whether
the sidebar was viewed or not. 


SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.21.1
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
Kernel Version: 5.11.1-1-MANJARO
Graphics Platform: X11
Graphics Processor: Mesa IntelĀ® HD Graphics 620

ADDITIONAL INFORMATION
Scaling: 200%, resolution 3840x2160 (primary), 2160x1440 (secondory)

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