Add retained paints and shared text selection

app-rust/tests/phone_screen.rs

@@ -127,6 +127,32 @@ fn a_long_press_and_drag_selects_text() {
     );
 }
 
+#[test]
+fn a_tap_after_selection_deselects_text() {
+    let (mut h, screen) = opened();
+    h.replay(&script(
+        "select-then-tap",
+        "0 down 300 1000\n\
+         520 move 300 1000\n\
+         560 move 700 1000\n\
+         600 move 900 1000\n\
+         640 up 900 1000\n\
+         800 down 540 1000\n\
+         880 up 540 1000",
+    ));
+
+    assert_eq!(
+        screen.selected_text(&mut h.rsc),
+        None,
+        "an ordinary tap after a selection must dismiss it"
+    );
+    assert_eq!(
+        h.state.opened_urls,
+        Vec::<String>::new(),
+        "the deselecting tap must be consumed rather than activating content"
+    );
+}
+
 #[test]
 fn the_composer_sits_above_a_simulated_ime_inset() {
     let (mut h, screen) = opened();