logiguard fork: GPUI xdg-activation keyboard-focus serial fix

Single-commit orphan branch: full zed-industries/zed @ 8c74db0 source tree
with a 3-file patch applied (no upstream history).

Patch (crates/gpui_linux/src/linux/wayland/):
  - serial.rs: add SerialKind::KeyboardEnter
  - client.rs: store wl_keyboard.enter serial; add latest_serial_of()
  - window.rs: activate() uses keyboard-enter serial (Mutter focus gate)

Mutter honors window activation only when the token carries the keyboard-
focus serial from wl_keyboard.enter; GPUI used a stale mouse-press serial.
See docs/tray-window-focus-wayland.md in logiguard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/task/src/static_source.rs

@@ -0,0 +1,123 @@
+//! A source of tasks, based on a static configuration, deserialized from the tasks config file, and related infrastructure for tracking changes to the file.
+
+use std::sync::Arc;
+
+use futures::{StreamExt, channel::mpsc::UnboundedSender};
+use gpui::{App, AppContext, TaskExt};
+use parking_lot::RwLock;
+use serde::Deserialize;
+use util::ResultExt;
+
+use crate::TaskTemplates;
+use futures::channel::mpsc::UnboundedReceiver;
+
+/// The source of tasks defined in a tasks config file.
+pub struct StaticSource {
+    tasks: TrackedFile<TaskTemplates>,
+}
+
+/// A Wrapper around deserializable T that keeps track of its contents
+/// via a provided channel.
+pub struct TrackedFile<T> {
+    parsed_contents: Arc<RwLock<T>>,
+}
+
+impl<T: PartialEq + 'static + Sync> TrackedFile<T> {
+    /// Initializes new [`TrackedFile`] with a type that's deserializable.
+    pub fn new(
+        mut tracker: UnboundedReceiver<String>,
+        notification_outlet: UnboundedSender<()>,
+        cx: &App,
+    ) -> Self
+    where
+        T: for<'a> Deserialize<'a> + Default + Send,
+    {
+        let parsed_contents: Arc<RwLock<T>> = Arc::default();
+        cx.background_spawn({
+            let parsed_contents = parsed_contents.clone();
+            async move {
+                while let Some(new_contents) = tracker.next().await {
+                    if Arc::strong_count(&parsed_contents) == 1 {
+                        // We're no longer being observed. Stop polling.
+                        break;
+                    }
+                    if !new_contents.trim().is_empty() {
+                        let Some(new_contents) =
+                            serde_json_lenient::from_str::<T>(&new_contents).log_err()
+                        else {
+                            continue;
+                        };
+                        let mut contents = parsed_contents.write();
+                        if *contents != new_contents {
+                            *contents = new_contents;
+                            if notification_outlet.unbounded_send(()).is_err() {
+                                // Whoever cared about contents is not around anymore.
+                                break;
+                            }
+                        }
+                    }
+                }
+                anyhow::Ok(())
+            }
+        })
+        .detach_and_log_err(cx);
+        Self { parsed_contents }
+    }
+
+    /// Initializes new [`TrackedFile`] with a type that's convertible from another deserializable type.
+    pub fn new_convertible<U: for<'a> Deserialize<'a> + TryInto<T, Error = anyhow::Error>>(
+        mut tracker: UnboundedReceiver<String>,
+        notification_outlet: UnboundedSender<()>,
+        cx: &App,
+    ) -> Self
+    where
+        T: Default + Send,
+    {
+        let parsed_contents: Arc<RwLock<T>> = Arc::default();
+        cx.background_spawn({
+            async move {
+                while let Some(new_contents) = tracker.next().await {
+                    if Arc::strong_count(&parsed_contents) == 1 {
+                        // We're no longer being observed. Stop polling.
+                        break;
+                    }
+
+                    if !new_contents.trim().is_empty() {
+                        let Some(new_contents) =
+                            serde_json_lenient::from_str::<U>(&new_contents).log_err()
+                        else {
+                            continue;
+                        };
+                        let Some(new_contents) = new_contents.try_into().log_err() else {
+                            continue;
+                        };
+                        let mut contents = parsed_contents.write();
+                        if *contents != new_contents {
+                            *contents = new_contents;
+                            if notification_outlet.unbounded_send(()).is_err() {
+                                // Whoever cared about contents is not around anymore.
+                                break;
+                            }
+                        }
+                    }
+                }
+                anyhow::Ok(())
+            }
+        })
+        .detach_and_log_err(cx);
+        Self {
+            parsed_contents: Default::default(),
+        }
+    }
+}
+
+impl StaticSource {
+    /// Initializes the static source, reacting on tasks config changes.
+    pub fn new(tasks: TrackedFile<TaskTemplates>) -> Self {
+        Self { tasks }
+    }
+    /// Returns current list of tasks
+    pub fn tasks_to_schedule(&self) -> TaskTemplates {
+        self.tasks.parsed_contents.read().clone()
+    }
+}