fix: restore focus after backend visibility resumes

src/it/tests/t0022_toplevel_suspended.rs

@@ -2,7 +2,7 @@ use {
     crate::{
         ifs::wl_surface::xdg_surface::xdg_toplevel::STATE_SUSPENDED,
         it::{
-            test_error::TestResult,
+            test_error::{TestErrorExt, TestResult},
             test_utils::{
                 test_ouput_node_ext::TestOutputNodeExt, test_toplevel_node_ext::TestToplevelNodeExt,
             },
@@ -10,7 +10,7 @@ use {
         },
     },
     isnt::std_1::collections::IsntHashSetExt,
-    std::rc::Rc,
+    std::{rc::Rc, time::Duration},
 };
 
 testcase!();
@@ -19,6 +19,7 @@ async fn test(run: Rc<TestRun>) -> TestResult {
     let ds = run.create_default_setup().await?;
 
     let client = run.create_client().await?;
+    let default_seat = client.get_default_seat().await?;
 
     let win1 = client.create_window().await?;
     win1.set_color(255, 0, 0, 255);
@@ -44,5 +45,23 @@ async fn test(run: Rc<TestRun>) -> TestResult {
     client.sync().await;
     tassert!(win2.tl.core.states.borrow().not_contains(&STATE_SUSPENDED));
 
+    let leaves = default_seat.kb.leave.expect()?;
+    let enters = default_seat.kb.enter.expect()?;
+
+    run.cfg.set_idle(Duration::from_micros(100))?;
+    run.cfg.set_idle_grace_period(Duration::from_secs(0))?;
+    run.state.wheel.timeout(3).await?;
+
+    client.sync().await;
+    tassert!(win2.tl.core.states.borrow().contains(&STATE_SUSPENDED));
+    let leave = leaves.next().with_context(|| "no leave on suspend")?;
+    tassert_eq!(leave.surface, win2.surface.id);
+
+    ds.mouse.rel(1.0, 1.0);
+    client.sync().await;
+    tassert!(win2.tl.core.states.borrow().not_contains(&STATE_SUSPENDED));
+    let enter = enters.next().with_context(|| "no enter on restore")?;
+    tassert_eq!(enter.surface, win2.surface.id);
+
     Ok(())
 }

src/tree/display.rs

@@ -8,18 +8,25 @@ use {
         renderer::Renderer,
         state::State,
         tree::{
-            FindTreeResult, FindTreeUsecase, FoundNode, Node, NodeId, NodeLayerLink, NodeLocation,
-            OutputNode, StackedNode, TileDragDestination, WorkspaceDragDestination,
+            Direction, FindTreeResult, FindTreeUsecase, FoundNode, Node, NodeId, NodeLayerLink,
+            NodeLocation, OutputNode, StackedNode, TileDragDestination, WorkspaceDragDestination,
             WorkspaceNodeId, walker::NodeVisitor,
         },
         utils::{copyhashmap::CopyHashMap, linkedlist::LinkedList},
     },
-    std::{cell::Cell, ops::Deref, rc::Rc},
+    std::{
+        cell::{Cell, RefCell},
+        mem,
+        ops::Deref,
+        rc::{Rc, Weak},
+    },
 };
 
 pub struct DisplayNode {
     pub id: NodeId,
     pub extents: Cell<Rect>,
+    visible: Cell<bool>,
+    suspend_restore_kb_foci: RefCell<Vec<(Rc<WlSeatGlobal>, Weak<dyn Node>)>>,
     pub outputs: CopyHashMap<ConnectorId, Rc<OutputNode>>,
     pub stacked: Rc<LinkedList<Rc<dyn StackedNode>>>,
     pub stacked_above_layers: Rc<LinkedList<Rc<dyn StackedNode>>>,
@@ -31,6 +38,8 @@ impl DisplayNode {
         let slf = Self {
             id,
             extents: Default::default(),
+            visible: Default::default(),
+            suspend_restore_kb_foci: Default::default(),
             outputs: Default::default(),
             stacked: Default::default(),
             stacked_above_layers: Default::default(),
@@ -71,6 +80,17 @@ impl DisplayNode {
 
     pub fn update_visible(&self, state: &State) {
         let visible = state.root_visible();
+        let was_visible = self.visible.replace(visible);
+        if !visible && was_visible {
+            let mut foci = self.suspend_restore_kb_foci.borrow_mut();
+            foci.clear();
+            for seat in state.globals.seats.lock().values() {
+                let node = seat.get_keyboard_node();
+                if node.node_id() != self.id {
+                    foci.push((seat.clone(), Rc::downgrade(&node)));
+                }
+            }
+        }
         for output in self.outputs.lock().values() {
             output.update_visible();
         }
@@ -82,6 +102,20 @@ impl DisplayNode {
         for seat in state.globals.seats.lock().values() {
             seat.set_visible(visible);
         }
+        if visible && !was_visible {
+            for (seat, node) in mem::take(&mut *self.suspend_restore_kb_foci.borrow_mut()) {
+                if seat.get_keyboard_node().node_id() == self.id {
+                    if let Some(node) = node.upgrade()
+                        && node.node_visible()
+                    {
+                        seat.focus_node(node);
+                    } else {
+                        seat.get_fallback_output()
+                            .take_keyboard_navigation_focus(&seat, Direction::Unspecified);
+                    }
+                }
+            }
+        }
         if visible {
             state.damage(self.extents.get());
         }