commands: add mouse sensitivity

[kaiserschmarrn0]

This commit adds an input command for a mouse sensitivity float. Relative mouse movements are multiplied by the sensitivity.

Fixes #3174

[ErikReider]

Could you add this to the IPC file? Would be nice to get the current value from swaymsg 😃

[kaiserschmarrn0]

Could you add this to the IPC file? Would be nice to get the current value from swaymsg

added

[primalmotion]

I'm using this patch and I can confirm it works great. It finally makes me able to drop that terribly imprecise "adaptive" profile, while not having the mouse moving like a snail

[ghost]

werks for me, finally allows me to actually have consistent mouse sensitivity between my installs while not having to change it on my mouse

[vyivel]

Doesn't pointer_accel do the same?

[kaiserschmarrn0]

pointer_accel is sorta close with the flat profile, but you're limited in the range of multipliers you can apply. maybe libinput had a good reason to do this, but it seems kinda bad to me. with the fastest pointer_accel, my mouse is too slow.

[emersion]

Maybe ask the libinput devs?

[primalmotion]

Seems everything is explained here https://people.freedesktop.org/~whot/libinput-rtd/pointer-acceleration.html#pointer-acceleration-on-trackpoints

From what I understand here, sensitivity is tweaking the hardware device config.

[notlesh]

I would love to see this get merged soon, is there anything holding it up? I'd be happy to help with it.

[primalmotion]

There is a small conflict with the recent master change. Could you update that PR, or do you want me to open a PR on your branch to fix it?

[mattfbacon]

Has this lost steam? I would love to have this feature

[jlo62]

Hi, I took myself the liberty to make a fork and clear the conflicts. Note I am new to github, and I didn't find out how to merge commits, so those 4 are 19 now. https://github.com/swaywm/sway/pull/7751