feat(settings): add Mouse & Touchpad settings tab for Niri (#2905)

* feat(settings): add Mouse & Trackpad settings tab

* style(settings): clarify touchpad natural scroll description

* chore(settings): update settings search index

* refactor(settings): unify Mouse & Trackpad terminology to Mouse & Touchpad

* feat(setup): deploy default dms/input.kdl on setup

* style(niri): restore include section comment in base config template

* refactor(niri): remove redundant input block from base config template

* refactor(niri): restore keyboard and non-mouse input config to base template

* feat(settings): add touchpad disable-on-external-mouse toggle

* feat(settings): add left-handed, scroll-factor and dwt options

* feat(settings): add middle-emulation, scroll-method, tap-and-drag and drag-lock options

* refactor(settings): re-order mouse and touchpad UI options logically

core/internal/config/deployer.go

@@ -264,6 +264,7 @@ func (cd *ConfigDeployer) deployNiriDmsConfigs(dmsDir, terminalCommand string) e
 		{"layout.kdl", NiriLayoutConfig},
 		{"alttab.kdl", NiriAlttabConfig},
 		{"binds.kdl", strings.ReplaceAll(NiriBindsConfig, "{{TERMINAL_COMMAND}}", terminalCommand)},
+		{"input.kdl", NiriInputConfig},
 		{"outputs.kdl", ""},
 		{"cursor.kdl", ""},
 		{"windowrules.kdl", ""},

core/internal/config/embedded/niri-input.kdl

@@ -0,0 +1,15 @@
+// ! DO NOT EDIT !
+// ! AUTO-GENERATED BY DMS !
+// ! CHANGES WILL BE OVERWRITTEN !
+// ! PLACE YOUR CUSTOM CONFIGURATION ELSEWHERE !
+
+input {
+    mouse {
+        accel-speed 0.0
+    }
+    touchpad {
+        tap
+        accel-speed 0.0
+        natural-scroll
+    }
+}

core/internal/config/embedded/niri.kdl

@@ -34,31 +34,6 @@ input {
         numlock
     }
 
-    // Next sections include libinput settings.
-    // Omitting settings disables them, or leaves them at their default values.
-    // All commented-out settings here are examples, not defaults.
-    touchpad {
-        // off
-        tap
-        // dwt
-        // dwtp
-        // drag false
-        // drag-lock
-        natural-scroll
-        // accel-speed 0.2
-        // accel-profile "flat"
-        // scroll-method "two-finger"
-        // disabled-on-external-mouse
-    }
-
-    mouse {
-        // off
-        // natural-scroll
-        // accel-speed 0.2
-        // accel-profile "flat"
-        // scroll-method "no-scroll"
-    }
-
     trackpoint {
         // off
         // natural-scroll
@@ -77,6 +52,7 @@ input {
     // Setting max-scroll-amount="0%" makes it work only on windows already fully on screen.
     // focus-follows-mouse max-scroll-amount="0%"
 }
+
 // You can configure outputs by their name, which you can find
 // by running `niri msg outputs` while inside a niri instance.
 // The built-in laptop monitor is usually called "eDP-1".
@@ -271,3 +247,4 @@ include optional=true "dms/alttab.kdl"
 include optional=true "dms/binds.kdl"
 include optional=true "dms/outputs.kdl"
 include optional=true "dms/cursor.kdl"
+include optional=true "dms/input.kdl"

core/internal/config/niri.go

@@ -16,3 +16,6 @@ var NiriAlttabConfig string
 
 //go:embed embedded/niri-binds.kdl
 var NiriBindsConfig string
+
+//go:embed embedded/niri-input.kdl
+var NiriInputConfig string