logiguard fork v2: patched GPUI on verified 8c74db0 tree

Rebuilt from the exact zed-industries/zed @ 8c74db00c4053d6c0a9037863d7bd048658da4ca
tree (previous orphan was based on a stale/wrong fetch). Same 3-file patch:
  - 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)

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

crates/settings_content/src/serde_helper.rs

@@ -0,0 +1,135 @@
+use serde::Serializer;
+
+/// Serializes an f32 value with 2 decimal places of precision.
+///
+/// This function rounds the value to 2 decimal places and formats it as a string,
+/// then parses it back to f64 before serialization. This ensures clean JSON output
+/// without IEEE 754 floating-point artifacts.
+///
+/// # Arguments
+///
+/// * `value` - The f32 value to serialize
+/// * `serializer` - The serde serializer to use
+///
+/// # Returns
+///
+/// Result of the serialization operation
+///
+/// # Usage
+///
+/// This function can be used with Serde's `serialize_with` attribute:
+/// ```
+/// use serde::Serialize;
+/// use settings_content::serialize_f32_with_two_decimal_places;
+///
+/// #[derive(Serialize)]
+/// struct ExampleStruct(#[serde(serialize_with = "serialize_f32_with_two_decimal_places")] f32);
+/// ```
+pub fn serialize_f32_with_two_decimal_places<S>(
+    value: &f32,
+    serializer: S,
+) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    let rounded = (value * 100.0).round() / 100.0;
+    let formatted = format!("{:.2}", rounded);
+    let clean_value: f64 = formatted.parse().unwrap_or(rounded as f64);
+    serializer.serialize_f64(clean_value)
+}
+
+/// Serializes an optional f32 value with 2 decimal places of precision.
+///
+/// This function handles `Option<f32>` types, serializing `Some` values with 2 decimal
+/// places of precision and `None` values as null. For `Some` values, it rounds to 2 decimal
+/// places and formats as a string, then parses back to f64 before serialization. This ensures
+/// clean JSON output without IEEE 754 floating-point artifacts.
+///
+/// # Arguments
+///
+/// * `value` - The optional f32 value to serialize
+/// * `serializer` - The serde serializer to use
+///
+/// # Returns
+///
+/// Result of the serialization operation
+///
+/// # Behavior
+///
+/// * `Some(v)` - Serializes the value rounded to 2 decimal places
+/// * `None` - Serializes as JSON null
+///
+/// # Usage
+///
+/// This function can be used with Serde's `serialize_with` attribute:
+/// ```
+/// use serde::Serialize;
+/// use settings_content::serialize_optional_f32_with_two_decimal_places;
+///
+/// #[derive(Serialize)]
+/// struct ExampleStruct {
+///     #[serde(serialize_with = "serialize_optional_f32_with_two_decimal_places")]
+///     optional_value: Option<f32>,
+/// }
+/// ```
+pub fn serialize_optional_f32_with_two_decimal_places<S>(
+    value: &Option<f32>,
+    serializer: S,
+) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    match value {
+        Some(v) => {
+            let rounded = (v * 100.0).round() / 100.0;
+            let formatted = format!("{:.2}", rounded);
+            let clean_value: f64 = formatted.parse().unwrap_or(rounded as f64);
+            serializer.serialize_some(&clean_value)
+        }
+        None => serializer.serialize_none(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde::{Deserialize, Serialize};
+
+    #[derive(Serialize, Deserialize)]
+    struct TestOptional {
+        #[serde(serialize_with = "serialize_optional_f32_with_two_decimal_places")]
+        value: Option<f32>,
+    }
+
+    #[derive(Serialize, Deserialize)]
+    struct TestNonOptional {
+        #[serde(serialize_with = "serialize_f32_with_two_decimal_places")]
+        value: f32,
+    }
+
+    #[test]
+    fn test_serialize_optional_f32_with_two_decimal_places() {
+        let cases = [
+            (Some(123.456789), r#"{"value":123.46}"#),
+            (Some(1.2), r#"{"value":1.2}"#),
+            (Some(300.00000), r#"{"value":300.0}"#),
+        ];
+        for (value, expected) in cases {
+            let value = TestOptional { value };
+            assert_eq!(serde_json::to_string(&value).unwrap(), expected);
+        }
+    }
+
+    #[test]
+    fn test_serialize_f32_with_two_decimal_places() {
+        let cases = [
+            (123.456789, r#"{"value":123.46}"#),
+            (1.200, r#"{"value":1.2}"#),
+            (300.00000, r#"{"value":300.0}"#),
+        ];
+        for (value, expected) in cases {
+            let value = TestNonOptional { value };
+            assert_eq!(serde_json::to_string(&value).unwrap(), expected);
+        }
+    }
+}