surface: commit subsurface state during parent commit

src/it/tests/t0038_subsurface_parent_state.rs

@@ -0,0 +1,38 @@
+use {
+    crate::{
+        it::{test_error::TestResult, testrun::TestRun},
+        theme::Color,
+    },
+    std::rc::Rc,
+};
+
+testcase!();
+
+async fn test(run: Rc<TestRun>) -> TestResult {
+    let _ds = run.create_default_setup().await?;
+
+    let client = run.create_client().await?;
+    let win = client.create_window().await?;
+    win.set_color(255, 255, 255, 255);
+    win.map2().await?;
+
+    let ss = client.comp.create_surface().await?;
+    let vp = client.viewporter.get_viewport(&ss)?;
+    vp.set_destination(100, 100)?;
+    let buf = client.spbm.create_buffer(Color::SOLID_BLACK)?;
+    ss.attach(buf.id)?;
+    ss.commit()?;
+
+    let ss = client.sub.get_subsurface(ss.id, win.surface.id).await?;
+    ss.set_position(0, 0)?;
+    win.surface.commit()?;
+
+    client.compare_screenshot("1", false).await?;
+
+    ss.set_position(100, 100)?;
+    win.surface.commit()?;
+
+    client.compare_screenshot("2", false).await?;
+
+    Ok(())
+}