Keep fullscreen dialogs visible and preserve window focus

compositor/src/stacking.rs

@@ -1,8 +1,15 @@
 use ferese_layout::WindowId;
 use std::collections::HashMap;
 
-pub(crate) fn layer_priority(floating: bool, zooming: bool, fullscreen: bool) -> u8 {
-    if fullscreen {
+pub(crate) fn layer_priority(
+    floating: bool,
+    zooming: bool,
+    fullscreen: bool,
+    above_fullscreen: bool,
+) -> u8 {
+    if above_fullscreen {
+        4
+    } else if fullscreen {
         3
     } else if floating {
         2
@@ -90,9 +97,18 @@ mod tests {
 
     #[test]
     fn floating_windows_stay_above_tiled_and_maximized_windows() {
-        assert!(layer_priority(true, false, false) > layer_priority(false, true, false));
-        assert!(layer_priority(false, true, false) > layer_priority(false, false, false));
-        assert!(layer_priority(false, false, true) > layer_priority(true, false, false));
+        assert!(
+            layer_priority(true, false, false, false) > layer_priority(false, true, false, false)
+        );
+        assert!(
+            layer_priority(false, true, false, false) > layer_priority(false, false, false, false)
+        );
+        assert!(
+            layer_priority(false, false, true, false) > layer_priority(true, false, false, false)
+        );
+        assert!(
+            layer_priority(true, false, false, true) > layer_priority(false, false, true, false)
+        );
     }
 
     #[test]