MC-161078Mouse discrete scroll option not working
When scrolling through the hotbar with the mouse I get a skipped slot every three slots like
so: 1-2-4-5-7-8...
According to MC-123773 this should be fixed with "Discrete Scrolling" enabled, but that option doesn't change anything.
Playing with the sensitivity leads to different results but nether one where one "click" of the wheel matches one move on the hotbar.
evtest reports the following consistent for each "click"::
Event: time 1568458547.186289, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1568458547.186289, type 2 (EV_REL), code 11 
, value -120
Event: time 1568458546.668323, type 2 (EV_REL), code 8 (REL_WHEEL), value 1
Event: time 1568458546.668323, type 2 (EV_REL), code 11 , value 120
Environment
Linux Wayland
Created Issue:
Mouse discrete scroll option not working
When scrolling through the hotbar with the mouse I get a skipped slot every three slots like
so: 1-2-4-5-7-8...
According to
MC-123773this should be fixed with "Discrete Scrolling" enabled, but that option doesn't change anything.Playing with the sensitivity leads to different results but nether one where one "click" of the wheel matches one move on the hotbar.
evtest reports the following consistent for each "click"::
Event: time 1568458547.186289, type 2 (EV_REL), code 8 (REL_WHEEL), value -1
Event: time 1568458547.186289, type 2 (EV_REL), code 11Event: time 1568458546.668323, type 2 (EV_REL), code 8 (REL_WHEEL), value 1
Event: time 1568458546.668323, type 2 (EV_REL), code 11Environment
Linux Wayland
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What's "Raw Input" set to? Does it change anything?
Nope, "Raw Input" makes no difference what so ever. The only thing that effects anything is "Scroll Sensitivity".
Setting it to 0.66666 (100/150 was a guess from the above behavior) sometimes works, but then after some time it changes and becomes:
1-1-3-3-5-5-...
So first click does nothing, second skips one and so on...
Is this still an issue in 1.16.4?
I've been having the same issue. I was running Xorg on my system, then switched to Wayland and had this issue. Switching back to Xorg, the problem was resolved. I also tried toggling the Discrete Scrolling and Raw Input settings, but no changes were made. The closest thing was altering the scrolling sensitivity, but got similar results to OP. If there's anything you want me to try out to further diagnose this, please let me know.
Edit: This issue is still prevalent on 1.19.2
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I've found a workaround for this issue. The underlying problem appears to be with XWayland. Using this repo (https://github.com/Admicos/minecraft-wayland/tree/one-nineteen , specifically the `one-nineteen` branch), and setting the JVM arguments to `-Dorg.lwjgl.glfw.libname=/usr/lib/libglfw.so`, I was able to patch GLFW to allow Minecraft to run using Wayland natively. After that, scrolling worked as expecting with Raw Input and Discrete Scrolling enabled. Switching back to the non-patched GLFW by removing the JVM arguments, the previous bugged behavior reappeared.