shell: trigger re-render when surface disappears

src/utils.rs

@@ -1,7 +1,13 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 use smithay::reexports::wayland_server::{Global, Interface, Resource};
-use std::convert::{AsRef, From};
+use std::{
+    convert::{AsRef, From},
+    sync::{
+        atomic::{AtomicBool, Ordering},
+        Arc,
+    },
+};
 
 pub struct GlobalDrop<I: Interface + AsRef<Resource<I>> + From<Resource<I>>>(Option<Global<I>>);
 
@@ -18,3 +24,20 @@ impl<I: Interface + AsRef<Resource<I>> + From<Resource<I>>> Drop for GlobalDrop<
         }
     }
 }
+
+// This hack will hopefully will be superseeded by a better solution, when smithay transitions to wayland-rs 0.30.
+// But until then there is not really a better way to schedule a repaint on surface destruction
+#[derive(Debug)]
+pub struct SurfaceDropNotifier(Arc<AtomicBool>);
+
+impl From<&crate::state::Common> for SurfaceDropNotifier {
+    fn from(state: &crate::state::Common) -> Self {
+        SurfaceDropNotifier(state.dirty_flag.clone())
+    }
+}
+
+impl Drop for SurfaceDropNotifier {
+    fn drop(&mut self) {
+        self.0.store(true, Ordering::SeqCst);
+    }
+}