config: add floating window criteria

jay-config/src/_private.rs

@@ -110,6 +110,7 @@ pub enum WindowCriterionIpc {
     },
     Types(WindowType),
     Client(ClientMatcher),
+    Floating,
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, Hash, Eq, PartialEq)]

jay-config/src/_private/client.rs

@@ -1657,6 +1657,7 @@ impl ConfigClient {
             WindowCriterion::TitleRegex(t) => string!(t, Title, true),
             WindowCriterion::AppId(t) => string!(t, AppId, false),
             WindowCriterion::AppIdRegex(t) => string!(t, AppId, true),
+            WindowCriterion::Floating => WindowCriterionIpc::Floating,
         };
         let res = self.send_with_response(&ClientMessage::CreateWindowMatcher { criterion });
         get_response!(

jay-config/src/window.rs

@@ -244,6 +244,8 @@ pub enum WindowCriterion<'a> {
     AppId(&'a str),
     /// Matches the app-id of the window with a regular expression.
     AppIdRegex(&'a str),
+    /// Matches if the window is floating.
+    Floating,
 }
 
 impl WindowCriterion<'_> {