fix: Composer: more room to edit pasted text before sending (#7049)

Produced by CodeWhale running in a Boat VM. Untested.

crates/tui/src/tui/composer_chrome.rs

@@ -69,16 +69,24 @@ mod tests {
     }
 
     #[test]
-    fn content_growth_expands_up_to_the_density_cap() {
+    fn content_growth_expands_past_the_density_cap_up_to_available_room() {
         // Six content rows + border fits under the Comfortable cap of 9.
         let height = desired_height(6, 0, 12, ComposerDensity::Comfortable, false);
         assert_eq!(height, 7, "typed content must grow the composer: {height}");
 
-        // Past the cap the density setting wins, not the content.
+        // Past the cap the content wins, bounded by the room on offer.
         let capped = desired_height(20, 0, 30, ComposerDensity::Comfortable, false);
-        assert_eq!(capped, 9, "Comfortable caps total rows at 9");
+        assert_eq!(
+            capped, 21,
+            "long content grows past the density cap: {capped}"
+        );
         let spacious = desired_height(20, 0, 30, ComposerDensity::Spacious, false);
-        assert_eq!(spacious, 12, "Spacious caps total rows at 12");
+        assert_eq!(
+            spacious, 21,
+            "long content grows past the density cap: {spacious}"
+        );
+        let bounded = desired_height(20, 0, 12, ComposerDensity::Comfortable, false);
+        assert_eq!(bounded, 12, "growth stops at the available room: {bounded}");
     }
 
     #[test]

crates/tui/src/tui/ui/frame.rs

@@ -1582,7 +1582,8 @@ pub(crate) fn render(f: &mut Frame, app: &mut App, _config: &Config) -> Option<(
                 .saturating_add(info_height)
                 .saturating_add(top_work_strip_height),
         )
-        .max(MIN_COMPOSER_HEIGHT);
+        .max(MIN_COMPOSER_HEIGHT)
+        .min((body_height / 2).max(MIN_COMPOSER_HEIGHT));
     let composer_height = if !pet_main && mini && !mini_cfg.keep_input {
         0
     } else {

crates/tui/src/tui/widgets/mod.rs

@@ -1480,8 +1480,7 @@ impl Renderable for ComposerWidget<'_> {
         self.render_plan(area, buf);
     }
     fn desired_height(&self, width: u16) -> u16 {
-        self.frame()
-            .desired_height(width, self.max_height.min(self.max_height_cap()))
+        self.frame().desired_height(width, self.max_height)
     }
     #[cfg(test)]
     fn cursor_pos(&self, area: Rect) -> Option<(u16, u16)> {
@@ -5746,11 +5745,15 @@ mod tests {
             assert_eq!(measure(&app), (n + 2, n), "{n} typed lines");
         }
 
-        // Past the cap the density setting wins, not the content.
+        // Past the cap the content wins, bounded by the room the layout
+        // offered (AVAILABLE): 40 input rows + 2 borders, capped at 24.
         app.clear_input();
         app.insert_str(&vec!["over"; 40].join("\n"));
-        let cap = composer_max_height(ComposerDensity::Comfortable);
-        assert_eq!(measure(&app), (cap, cap - 2), "content beyond the cap");
+        assert_eq!(
+            measure(&app),
+            (AVAILABLE, AVAILABLE - 2),
+            "long draft grows past the cap"
+        );
 
         // Submitting returns the composer to its stable density floor.
         assert!(app.submit_input().is_some());

vendor/codewhale-ratatui/src/components/native_composer.rs

@@ -194,10 +194,13 @@ pub fn native_composer_height(
     } else {
         usize::from(available >= 2)
     };
-    rows.max(floor)
-        .saturating_add(menu)
-        .saturating_add(border)
-        .clamp(1, usize::from(available.min(density.max_rows()))) as u16
+    let desired = rows.max(floor).saturating_add(menu).saturating_add(border);
+    let cap = if desired > usize::from(density.max_rows()) {
+        usize::from(available)
+    } else {
+        usize::from(available).min(usize::from(density.max_rows()))
+    };
+    desired.clamp(1, cap) as u16
 }
 
 /// Display width after the kit's control/bidi guard; raw source scalars remain