Add option to prevent cursor warping when switching outputs

docs/wiki/Configuration:-Input.md

@@ -103,6 +103,7 @@ input {
     // warp-mouse-to-focus
     // focus-follows-mouse max-scroll-amount="0%"
     // workspace-auto-back-and-forth
+    // disable-mouse-warp-to-focused-output
 
     // mod-key "Super"
     // mod-key-nested "Alt"
@@ -364,6 +365,18 @@ input {
 }
 ```
 
+#### `disable-mouse-warp-to-focused-output`
+
+<sup>Since: next release</sup>
+
+Prevents warping the cursor to a different output when switching monitors.
+
+```kdl
+input {
+    disable-mouse-warp-to-focused-output
+}
+```
+
 #### `mod-key`, `mod-key-nested`
 
 <sup>Since: 25.05</sup>

niri-config/src/input.rs

@@ -23,6 +23,7 @@ pub struct Input {
     pub workspace_auto_back_and_forth: bool,
     pub mod_key: Option<ModKey>,
     pub mod_key_nested: Option<ModKey>,
+    pub disable_mouse_warp_to_focused_output: bool,
 }
 
 #[derive(knuffel::Decode, Debug, Default, PartialEq)]
@@ -53,6 +54,8 @@ pub struct InputPart {
     pub mod_key: Option<ModKey>,
     #[knuffel(child, unwrap(argument, str))]
     pub mod_key_nested: Option<ModKey>,
+    #[knuffel(child)]
+    pub disable_mouse_warp_to_focused_output: Option<Flag>,
 }
 
 impl MergeWith<InputPart> for Input {
@@ -62,6 +65,7 @@ impl MergeWith<InputPart> for Input {
             keyboard,
             disable_power_key_handling,
             workspace_auto_back_and_forth,
+            disable_mouse_warp_to_focused_output,
         );
 
         merge_clone!(

niri-config/src/lib.rs

@@ -1024,6 +1024,7 @@ mod tests {
                 mod_key_nested: Some(
                     Super,
                 ),
+                disable_mouse_warp_to_focused_output: false,
             },
             outputs: Outputs(
                 [