Bright line visual artifacts in fullscreen mode
With gThumb 3.10, when viewing certain (but not all) non-transparent images in full screen mode, a narrow vertical line, in the 'transparent background' color is painted on the right edge of the image.
In addition, when viewing any image in full screen mode, a single pixel bright line is painted at the bottom of the screen.
Steps to replicate:
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Configure gThumb to use a bright transparency color, such as 'checkered' or 'white.' (preferences > viewer > transparency).
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Download the full resolution JPEG of this image from Unsplash: https://unsplash.com/photos/jtsW--Z6bFw
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Open the image in gThumb and enter full screen mode.
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A bright line will appear on the right hand side of the image. In addition, a medium-grey line will be visible at the bottom of the screen.