Add the LoadConfigFile action (#2163)

* Add the `LoadConfigFile` action

* fixes

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

src/niri.rs

@@ -164,6 +164,7 @@ use crate::ui::screen_transition::{self, ScreenTransition};
 use crate::ui::screenshot_ui::{OutputScreenshot, ScreenshotUi, ScreenshotUiRenderElement};
 use crate::utils::scale::{closest_representable_scale, guess_monitor_scale};
 use crate::utils::spawning::{CHILD_DISPLAY, CHILD_ENV};
+use crate::utils::watcher::Watcher;
 use crate::utils::xwayland::satellite::Satellite;
 use crate::utils::{
     center, center_f64, expand_home, get_monotonic_time, ipc_transform_to_smithay, is_mapped,
@@ -190,6 +191,8 @@ pub struct Niri {
     /// (and transient changes dropped).
     pub config_file_output_config: niri_config::Outputs,
 
+    pub config_file_watcher: Option<Watcher>,
+
     pub event_loop: LoopHandle<'static, State>,
     pub scheduler: Scheduler<()>,
     pub stop_signal: LoopSignal,
@@ -2528,6 +2531,7 @@ impl Niri {
         let mut niri = Self {
             config,
             config_file_output_config,
+            config_file_watcher: None,
 
             event_loop,
             scheduler,