Since upgrading to 1.15.2 I'm seeing an intermittent delay in movement when sprinting forwards from standstill with custom sprint/sneak controls.
I've remapped the Shift key to sprint, and the ctrl key to sneak, as that is what I am familiar with from other games. This issue only happens for me when the sprint/sneak keys are swapped
I've recorded an example here, with the keys being pressed as an overlay, which shows first the delay, and then back to normal maps for sprint/sneak
The delay is not consistent, sometimes it's hardly noticeable, but seems most pronounced when I'm being attacked by mobs, and the delay at that point is most unwelcome 🙂
Environment
Operating System: Fedora 31 (Workstation Edition)
CPE OS Name: cpe:/o:fedoraproject:fedora:31
Kernel: Linux 5.4.17-200.fc31.x86_64
Architecture: x86-64
[~] $ java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (build 1.8.0_242-b08)
OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)
Linked issues
duplicates 1
Comments 3
Setting the ENV as described as the work-around in MC-122421 seems to resolve the problem:
[minecraft-launcher] $ export XMODIFIERS=@im=null
[minecraft-launcher] $ ./minecraft-launcher
No delay with that set....
Does MC-122421 describe your issue?