Created attachment 181452 [details] photos of the screen When rendering a pdf, there are sometimes a complete line of pixels missing or being duplicated. This makes text blurry, and sometimes changes its meaning (a missing line of pixel might change a = into a - in a math document...). I am attaching two photos of the screen in the file bug.jpg. On the left, the bug is visible four times: there are two duplicated pixel lines in the third line of text (check the word "consectetuer"), and two missing pixel lines in the fourth line of text (check the word "pretium": the top is shaved, and the horizontal line in the e is too small). The right part of bug.jpg shows the same text correctly rendered. I am using kde on an uptodate fedora 41 distribution, with screen scaling enabled at 125%. If I set screen scaling at 100%, I don't see the bug anymore. I see the bug quite easily with xorg; it happens also with wayland, but much less frequently. The bug happens when scrolling the text within a fixed window, on the laptop screen (there are no external monitor plugged in). One can usually make the bug disappear by scrolling around or playing with zoom levels. When I took the attached photos, it was enough to give the focus to another application to make the bug disappear: clicking on another window seemed to force a redraw of okular (why?) with no extra or missing lines. This is mostly horizontal lines, but I have also seen, much less frequently, missing vertical lines of pixel. fedora 41 plasma and kwin 6.3.5 wayland 1.23 qt 6.8.2 xorg 21.1.16 okular 25.04 poppler 24.08
Created attachment 182429 [details] photos of the screen I have upgraded my laptop to fedora 42, and the bug is still present fedora 42 plasma and kwin 6.3.5 wayland 1.23 qt 6.9.1 okular 25.04 poppler 25.02 I am attaching a picture with three photos of my screen while using wayland with a 125% global scaling factor. For some math equations, I had a missing line hiding the lower bar of an equal sign. By scrolling a bit, the missing line hid the fraction bar. By scrolling a bit more, I had my equation well rendered.