config: add uid client criteria

jay-config/src/_private.rs

@@ -82,6 +82,7 @@ pub enum ClientCriterionIpc {
         regex: bool,
     },
     Sandboxed,
+    Uid(i32),
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, Hash, Eq, PartialEq)]

jay-config/src/_private/client.rs

@@ -1542,6 +1542,7 @@ impl ConfigClient {
             ClientCriterion::SandboxInstanceId(t) => string!(t, SandboxInstanceId, false),
             ClientCriterion::SandboxInstanceIdRegex(t) => string!(t, SandboxInstanceId, true),
             ClientCriterion::Sandboxed => ClientCriterionIpc::Sandboxed,
+            ClientCriterion::Uid(p) => ClientCriterionIpc::Uid(p),
         };
         let res = self.send_with_response(&ClientMessage::CreateClientMatcher { criterion });
         get_response!(

jay-config/src/client.rs

@@ -77,6 +77,8 @@ pub enum ClientCriterion<'a> {
     SandboxInstanceIdRegex(&'a str),
     /// Matches if the client is sandboxed.
     Sandboxed,
+    /// Matches the user ID of the client.
+    Uid(i32),
 }
 
 impl ClientCriterion<'_> {