Created attachment 125130 [details] Recording SUMMARY Sometimes, apart from the menu bar (File, Edit, ...), the app's perception of the mouse location offset from the actual mouse cursor. All the widgets and buttons are difficult to use. Interestingly, the panel/frameset highlight _is_ accurately responding to the mouse cursor. When there is not enough space to 'click above', the buttons are unreachable. Changing the Window Size impacts the resulting offset. In the maximized window, perhaps it's ~100 pixels vertically. Windowed, it increases to 600+ pixels. Putting your computer to sleep and waking sometimes fixes this problem. STEPS TO REPRODUCE 1. Start KdenLive 19.12.1 AppImage 2. Hover over and click widgets OBSERVED RESULT Please see the attached recording. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Linux Mint 19.3 AKA Ubuntu 18.04.2 KDE Frameworks 5.61.0 Qt 5.12.4 (built against 5.12.4) The xcb windowing system ADDITIONAL INFORMATION Linux HWE 5.3.0-24-generic #26~18.04.2-Ubuntu SMP x86_64 GeForce GTX 970/PCIe/SSE2 profile 4.6.0 NVIDIA 435.21 shader 4.60 NVIDIA
IMPORTANT UPDATE I just discovered this now. Disregard the first and last "sometimes". The effect is constant, but only when using a WACOM GRAPHIRE TABLET for input. Which I do almost exclusively. Using a basic mouse, the problem is not there. $ lsusb | grep -i wacom Bus 005 Device 004: ID 056a:0011 Wacom Co., Ltd Graphire 2 4x5
> Which I do almost exclusively To be clear, I am not observing this behavior in any other app I'm using. Although I believe Kdenlive is the first and only KDE app I'm using. For the first time.
This seems to be an upstream issue with the Wacom driver or the OS. Maybe updating Ubuntu to 19.04 could solve the problem.
We don't use non-LTS. Switching to 20.04 LTS is scheduled for this summer. Puzzling that Wacom input works fine with 19 out of 20 apps except Kdenlive. What does Kdenlive uniquely use that I can investigate more for upstream issues?
Does it still happen after your system update? Can you please test with the latest version (20.12.3 at the moment, https://kdenlive.org/en/download/) and close this report if it is not relevant anymore?
I cannot test the latest version because it crashes on me after running some tasks: AppRun: line 42: 406502 Segmentation fault (core dumped) kdenlive --config kdenlive-appimagerc $@ I am marking the issue as resolved anyway because I cannot reproduce this in the reported version. Chances are that some unrelated software updates have fixed input issues with graphic tablet pointers in the meantime. If I notice this again, I will reopen the issue.