SUMMARY You can mostly see this bug happening while clicking in Chromium browser or other browsers, sometimes which seems random at first, when you click on an image or a menu on a web page it's displayed like it's going to be dragged although you released mouse left button and you can move that stuck in drag position block or image up or down without holding any mouse buttons, like you're actually dragging it. It happens with both libinput driver and mouse-evdev driver and in case of libinput you don't have a reliable workaround yet switching o mouse-evdev to provides you an opportunity to apply a workaround I found trying to fight with that bug described below. To work around this problem set: Pointer acceleration : 2.1 Pointer threshold : 1 pixel Drag Start Distance : 4 pixels To make this bug happening often you would have to set: Pointer acceleration : 2.1 Pointer threshold : 4 pixel Drag Start Distance : 4 pixels it happens with me with Logitech MX518 and it's a new issue which I first started seeing with Neon. Basically what happens here is that when Pointer threshold is equal to Drag Start Distance and you click on the mouse it's often that the mouse physically slides slightly at the moment the left mouse button is clicked and when this happens and Pointer Threshold is equal to Drag Start Distance (which is default for libinput as it seems) - the block the mouse is clicked on gets stuck quite often in Drag position involuntarily which is very annoying. The same issue is described here: https://forum.manjaro.org/t/drag-start-mouse-settings-dont-seem-to-do-anything/117793/3 SOFTWARE/OS VERSIONS Linux/KDE Plasma: Linux 5.4.80-gentoo-r1-x86_64 #1 SMP PREEMPT (available in About System) KDE Plasma Version: 5.23.2 KDE Frameworks Version: 5.87.0 Qt Version: 5.15.2 Mouse: Logitech MX518 (checked two of them, same bug with both)
Thank you for the bug report! However Plasma 5.23.2 is no longer eligible for support or maintenance from KDE; supported versions are 5.27, and 5.27 or newer. Please upgrade to a supported version as soon as your distribution makes it available to you. Plasma is a fast-moving project, and bugs in one version are often fixed in the next one. If you need support for Plasma 5.23.2, please contact your distribution, who bears the responsibility of providing support for older releases that are no longer supported by KDE. If you can reproduce the issue after upgrading to a supported version, feel free to re-open this bug report.