state: Use IM hint and purpose for layout selection

src/animation.rs

@@ -6,19 +6,21 @@
 
 use std::time::Duration;
 
+use crate::imservice::ContentPurpose;
+use crate::layout::ArrangementKind;
 use crate::outputs::OutputId;
 use crate::panel::PixelSize;
-use crate::layout::ArrangementKind;
 
 /// The keyboard should hide after this has elapsed to prevent flickering.
 pub const HIDING_TIMEOUT: Duration = Duration::from_millis(200);
 
-/// Panel contents
+/// Description of parameters which influence panel contents
 #[derive(PartialEq, Clone, Debug)]
 pub struct Contents {
     pub name: String,
     pub kind: ArrangementKind,
     pub overlay_name: Option<String>,
+    pub purpose: ContentPurpose,
 }
 
 /// The outwardly visible state of visibility