Introduce selector flag and decouple iced_widget from iced_runtime

selector/src/lib.rs

@@ -66,6 +66,40 @@ impl Selector for &str {
     }
 }
 
+impl Selector for String {
+    type Output = target::Text;
+
+    fn select(&mut self, target: Target<'_>) -> Option<Self::Output> {
+        match target {
+            Target::TextInput {
+                id,
+                bounds,
+                visible_bounds,
+                state,
+            } if state.text() == *self => Some(target::Text::Input {
+                id: id.cloned(),
+                bounds,
+                visible_bounds,
+            }),
+            Target::Text {
+                id,
+                bounds,
+                visible_bounds,
+                content,
+            } if content == *self => Some(target::Text::Raw {
+                id: id.cloned(),
+                bounds,
+                visible_bounds,
+            }),
+            _ => None,
+        }
+    }
+
+    fn description(&self) -> String {
+        format!("text == \"{}\"", self.escape_default())
+    }
+}
+
 impl Selector for Id {
     type Output = target::Match;