iris: move text state into shared resources

app/src/ui/composer.rs

@@ -6,8 +6,7 @@ const APPROX_LINE_HEIGHT_DP: f32 = 24.0;
 const FIELD_PAD_DP: f32 = 12.0;
 
 /// `field` is exposed so the caller can read its content on submit
-/// (`field.edit(rsc).text()`) and clear it afterward
-/// (`field.edit(rsc).set("")`).
+/// (`field(rsc).text()`) and clear it afterward (`field(rsc).set("")`).
 pub struct Composer {
     pub field: WeakWidget<TextEdit>,
     /// The bar's own outer padding -- only `bottom` is ever changed, by