Popup-in-popup (draft)

tests/egui_tests/tests/snapshots/combobox_in_popup.png

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+version https://git-lfs.github.com/spec/v1
+oid sha256:e8876d1b19c1d8c0cac30edc022913ca88ba7afaedf677e9c5de07c3b45e3b8a
+size 10595

tests/egui_tests/tests/test_popups.rs

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+use egui::{ComboBox, Popup, PopupCloseBehavior, Vec2};
+use egui_kittest::kittest::Queryable as _;
+use egui_kittest::Harness;
+
+#[test]
+fn test_interactive_tooltip() {
+    struct State {
+        link_clicked: bool,
+    }
+
+    let mut harness = egui_kittest::Harness::new_ui_state(
+        |ui, state| {
+            ui.label("I have a tooltip").on_hover_ui(|ui| {
+                if ui.link("link").clicked() {
+                    state.link_clicked = true;
+                }
+            });
+        },
+        State {
+            link_clicked: false,
+        },
+    );
+
+    harness.get_by_label_contains("tooltip").hover();
+    harness.run();
+    harness.get_by_label("link").hover();
+    harness.run();
+    harness.get_by_label("link").click();
+
+    harness.run();
+
+    assert!(harness.state().link_clicked);
+}
+
+#[test]
+fn test_combobox_in_popup() {
+    let mut harness = Harness::builder()
+        .with_size(Vec2::new(200.0, 200.0))
+        .build_ui_state(
+            |ui, state| {
+                let response = ui.button("Open Popup");
+                Popup::menu(&response)
+                    .close_behavior(PopupCloseBehavior::CloseOnClickOutside)
+                    .show(|ui| {
+                        ui.heading("Popup");
+                        ComboBox::new("combo", "")
+                            .selected_text("Select an option")
+                            .close_behavior(PopupCloseBehavior::CloseOnClickOutside)
+                            .show_ui(ui, |ui| {
+                                ui.selectable_value(state, 0, "Option 0");
+                                ui.selectable_value(state, 1, "Option 1");
+                            });
+                    });
+            },
+            0,
+        );
+
+    harness.get_by_label("Open Popup").click();
+    harness.run();
+    harness.get_by_value("Select an option").click();
+    harness.run();
+    harness.get_by_label("Option 1").click();
+    harness.run();
+    assert_eq!(*harness.state(), 1);
+
+    // The parent popup should not close when clicking on the child popup
+    harness.get_by_label("Option 0").click();
+    harness.run();
+    assert_eq!(*harness.state(), 0);
+
+    harness.snapshot("combobox_in_popup");
+
+    // Clicking the parent popup should close the child popup
+    harness.get_by_label("Popup").click();
+    harness.run();
+    assert_eq!(harness.query_by_label("Option 0"), None);
+
+    harness.get_by_value("Select an option").click();
+    harness.run();
+
+    assert_eq!(harness.query_by_label("Option 0").is_some(), true);
+
+    // Clicking outside should close both popups
+    harness.get_by_label("Open Popup").click();
+    harness.run();
+
+    assert_eq!(harness.query_by_label("Popup"), None);
+}