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/gpui/examples/text_wrapper.rs

@@ -0,0 +1,138 @@
+#![cfg_attr(target_family = "wasm", no_main)]
+
+use gpui::{
+    App, Bounds, Context, TextOverflow, Window, WindowBounds, WindowOptions, div, prelude::*, px,
+    size,
+};
+use gpui_platform::application;
+
+struct HelloWorld {}
+
+impl Render for HelloWorld {
+    fn render(&mut self, _window: &mut Window, _cx: &mut Context<Self>) -> impl IntoElement {
+        let text = "The longest word 你好世界这段是中文，こんにちはこの段落は日本語です in any of the major \
+            English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, a word that \
+            refers to a lung disease contracted from the inhalation of very fine silica particles, \
+            a url https://github.com/zed-industries/zed/pull/35724?query=foo&bar=2, \
+            specifically from a volcano; medically, it is the same as silicosis.";
+        div()
+            .id("page")
+            .size_full()
+            .flex()
+            .flex_col()
+            .p_2()
+            .gap_2()
+            .bg(gpui::white())
+            .child(
+                div()
+                    .flex()
+                    .flex_row()
+                    .flex_shrink_0()
+                    .gap_2()
+                    .child(
+                        div()
+                            .flex()
+                            .border_1()
+                            .border_color(gpui::red())
+                            .text_ellipsis()
+                            .child("longer text in flex 1"),
+                    )
+                    .child(
+                        div()
+                            .flex()
+                            .border_1()
+                            .border_color(gpui::red())
+                            .text_ellipsis()
+                            .child("short flex"),
+                    )
+                    .child(
+                        div()
+                            .overflow_hidden()
+                            .border_1()
+                            .border_color(gpui::red())
+                            .text_ellipsis()
+                            .w_full()
+                            .child("A short text in normal div"),
+                    ),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_xl()
+                    .truncate()
+                    .border_1()
+                    .border_color(gpui::blue())
+                    .child("ELLIPSIS: ".to_owned() + text),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_xl()
+                    .overflow_hidden()
+                    .text_ellipsis()
+                    .line_clamp(2)
+                    .border_1()
+                    .border_color(gpui::blue())
+                    .child("ELLIPSIS 2 lines: ".to_owned() + text),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_xl()
+                    .overflow_hidden()
+                    .text_overflow(TextOverflow::Truncate("".into()))
+                    .border_1()
+                    .border_color(gpui::green())
+                    .child("TRUNCATE: ".to_owned() + text),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_xl()
+                    .overflow_hidden()
+                    .text_overflow(TextOverflow::Truncate("".into()))
+                    .line_clamp(3)
+                    .border_1()
+                    .border_color(gpui::green())
+                    .child("TRUNCATE 3 lines: ".to_owned() + text),
+            )
+            .child(
+                div()
+                    .flex_shrink_0()
+                    .text_xl()
+                    .whitespace_nowrap()
+                    .overflow_hidden()
+                    .border_1()
+                    .border_color(gpui::black())
+                    .child("NOWRAP: ".to_owned() + text),
+            )
+            .child(div().text_xl().w_full().child(text))
+    }
+}
+
+fn run_example() {
+    application().run(|cx: &mut App| {
+        let bounds = Bounds::centered(None, size(px(800.0), px(600.0)), cx);
+        cx.open_window(
+            WindowOptions {
+                window_bounds: Some(WindowBounds::Windowed(bounds)),
+                ..Default::default()
+            },
+            |_, cx| cx.new(|_| HelloWorld {}),
+        )
+        .unwrap();
+        cx.activate(true);
+    });
+}
+
+#[cfg(not(target_family = "wasm"))]
+fn main() {
+    run_example();
+}
+
+#[cfg(target_family = "wasm")]
+#[wasm_bindgen::prelude::wasm_bindgen(start)]
+pub fn start() {
+    gpui_platform::web_init();
+    run_example();
+}