wl_subsurface: unconditionally update visibility upon first parent commit

src/it/tests/t0054_subsurface_already_attached.rs

@@ -0,0 +1,47 @@
+use {
+    crate::{
+        it::{test_error::TestError, testrun::TestRun},
+        theme::Color,
+        tree::Node,
+    },
+    std::rc::Rc,
+};
+
+testcase!();
+
+/// Test subsurface with already attached buffer
+async fn test(run: Rc<TestRun>) -> Result<(), TestError> {
+    run.backend.install_default()?;
+
+    let seat = run.get_seat("default")?;
+
+    run.state.eng.yield_now().await;
+
+    run.cfg.show_workspace(seat.id(), "")?;
+
+    let client = run.create_client().await?;
+
+    let parent = client.create_window().await?;
+    parent.map().await?;
+    parent.set_color(0, 0, 0, 255);
+
+    let child = client.comp.create_surface().await?;
+    let buffer = client
+        .spbm
+        .create_buffer(Color::from_srgba_straight(255, 255, 255, 255))?;
+    child.attach(buffer.id)?;
+    let child_viewport = client.viewporter.get_viewport(&child)?;
+    child_viewport.set_source(0, 0, 1, 1)?;
+    child_viewport.set_destination(100, 100)?;
+    child.commit()?;
+
+    let _sub = client
+        .sub
+        .get_subsurface(child.id, parent.surface.id)
+        .await?;
+    parent.map().await?;
+
+    tassert!(child.server.node_visible());
+
+    Ok(())
+}