Preserve input focus across passive overlays

README.md

@@ -2,7 +2,7 @@
 
 RuDS is a native Rust blogging desktop application and the successor to bDS2. It manages local projects from authoring through preview, static-site generation, integrity checks, and publishing while preserving the existing bDS filesystem and SQLite formats.
 
-The desktop is a single-window application: closing its window persists UI state and exits RuDS.
+The desktop is a single-window application: closing its window persists UI state and exits RuDS. Background notifications remain unobtrusive and preserve keyboard focus while editing.
 
 The project is under active development. Core blogging workflows are broadly available; remaining core work and optional extensions are tracked separately.
 

crates/bds-ui/src/views/workspace.rs

@@ -387,16 +387,17 @@ pub fn view<'a>(
         overlays.push(modal::view(modal_state, locale, data_dir));
     }
 
-    if overlays.is_empty() {
-        base_layout
-    } else {
-        let mut layers = vec![base_layout];
-        layers.extend(overlays);
-        stack(layers)
-            .width(Length::Fill)
-            .height(Length::Fill)
-            .into()
-    }
+    workspace_with_overlays(base_layout, overlays)
+}
+
+fn workspace_with_overlays<'a>(
+    base_layout: Element<'a, Message>,
+    overlays: Vec<Element<'a, Message>>,
+) -> Element<'a, Message> {
+    stack(std::iter::once(base_layout).chain(overlays))
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into()
 }
 
 /// Route the content area based on the active tab type.
@@ -711,6 +712,11 @@ fn loading_view<'a>(locale: UiLocale) -> Element<'a, Message> {
 mod tests {
     use super::*;
     use crate::state::tabs::{Tab, TabType};
+    use iced::advanced::widget::Tree;
+    use iced::widget::text_input;
+
+    type TextInputState =
+        text_input::State<<iced::Renderer as iced::advanced::text::Renderer>::Paragraph>;
 
     fn tab(id: &str, tab_type: TabType, title: &str) -> Tab {
         Tab {
@@ -722,6 +728,38 @@ mod tests {
         }
     }
 
+    #[test]
+    fn overlays_preserve_the_focused_workspace_input() {
+        let base = || -> Element<'static, Message> {
+            text_input("Commit message", "draft")
+                .on_input(|_| Message::Noop)
+                .into()
+        };
+        let mut tree = Tree::new(workspace_with_overlays(base(), Vec::new()).as_widget());
+        tree.children[0]
+            .state
+            .downcast_mut::<TextInputState>()
+            .focus();
+
+        let with_toast = workspace_with_overlays(base(), vec![text("Done").into()]);
+        tree.diff(with_toast.as_widget());
+        assert!(
+            tree.children[0]
+                .state
+                .downcast_ref::<TextInputState>()
+                .is_focused()
+        );
+
+        let without_toast = workspace_with_overlays(base(), Vec::new());
+        tree.diff(without_toast.as_widget());
+        assert!(
+            tree.children[0]
+                .state
+                .downcast_ref::<TextInputState>()
+                .is_focused()
+        );
+    }
+
     #[test]
     fn style_tab_routes_to_real_editor_only_with_project_state() {
         let empty_posts = HashMap::new();

specs/layout.allium

@@ -210,6 +210,11 @@ invariant ActivityActiveHighlight {
         btn.active = (active_view = btn.id and sidebar_visible)
 }
 
+invariant PassiveOverlayFocusStability {
+    -- Adding or removing passive overlays such as toasts and background-task
+    -- notifications never changes the keyboard-focused control.
+}
+
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