399072 2018-09-25 19:02:46 +0000 Horizontal Lines Displayed in Kate with Fractional HiDPI Scaling 2019-05-29 14:35:08 +0000 1 1 2 Applications kate general 18.08.1 Arch Linux Linux RESOLVED DUPLICATE 390451 NOR normal --- 0 bugreporter11 kwrite-bugs-null lukebenes 0 oldest_to_newest 1787183 0 bugreporter11 2018-09-25 19:02:46 +0000 SUMMARY This may be related to bug #373232 for Konsole. As in Konsole, Kate displays random horizontal lines when fractional (e.g., 1.3, 1.7) display scaling is used on HiDPI displays. The workaround is to use integer scaling, but this is impractical on many modern devices with 2K or 4K display and laptop-sized displays. STEPS TO REPRODUCE - on hardware with a high resolution screen such as 2K 1. Open System Settings > Display & Monitor > Scale Display 2. Select a non-integer scale factor and save the setting 3. OBSERVED RESULT Horizontal lines randomly appear which are not part of the document, especially when selecting text or scrolling. EXPECTED RESULT A document which is displayed corrected with no extraneous horizontal lines or other visual artifacts. SOFTWARE VERSIONS KDE Plasma Version: 5.13.5 KDE Frameworks Version: 5.50.0 Qt Version: Qt 5.11.1 (built against 5.11.1) QMake version 3.1 ADDITIONAL INFORMATION Please see https://bugs.kde.org/show_bug.cgi?id=373232 https://bugsfiles.kde.org/attachment.cgi?id=109683 1787184 1 bugreporter11 2018-09-25 19:04:57 +0000 I see that Kate was fixed upstream in Qt 5.12: https://bugreports.qt.io/browse/QTBUG-66036 I also see that this is a duplicate of https://bugreports.qt.io/browse/QTBUG-66036 1787192 2 dhaumann 2018-09-25 19:18:49 +0000 Yes, Qt 5.12 should finally solve this. Let's close this for now - please reopen, if Qt 5.12 does not fix it for you. *** This bug has been marked as a duplicate of bug 373232 *** 1859430 3 lukebenes 2019-05-29 14:35:08 +0000 *** This bug has been marked as a duplicate of bug 390451 ***