Tooltips wrap every line and grow with their text

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui.rs

@@ -515,10 +515,21 @@ pub struct Ui {
     hud_h: f32,
 }
 
+// word wrap to `cols` characters: keeps line breaks, splits words longer than a line
 pub fn wrap(s: &str, cols: usize) -> Vec<String> {
+    let cols = cols.max(1);
     let mut out = Vec::new();
+    for para in s.split('\n') {
         let mut line = String::new();
-    for word in s.split(' ') {
+        for word in para.split(' ') {
+            let mut word: Vec<char> = word.chars().collect();
+            while word.len() > cols {
+                if !line.is_empty() {
+                    out.push(std::mem::take(&mut line));
+                }
+                out.push(word.drain(..cols).collect());
+            }
+            let word: String = word.into_iter().collect();
             let len = line.chars().count();
             if len > 0 && len + 1 + word.chars().count() > cols {
                 out.push(std::mem::take(&mut line));
@@ -526,14 +537,27 @@ pub fn wrap(s: &str, cols: usize) -> Vec<String> {
             if !line.is_empty() {
                 line.push(' ');
             }
-        line.push_str(word);
+            line.push_str(&word);
         }
-    if !line.is_empty() {
         out.push(line);
     }
+    while out.last().map_or(false, |l| l.is_empty()) {
+        out.pop();
+    }
     out
 }
 
+#[cfg(test)]
+mod wrap_tests {
+    #[test]
+    fn wrap_keeps_every_line_inside() {
+        let l = super::wrap("Cost: 30 gold + 2 wood/tile over water, 60 gold over lava", 20);
+        assert!(l.len() >= 3 && l.iter().all(|x| x.chars().count() <= 20), "{:?}", l);
+        let l = super::wrap("a\nsuperlongwordwithoutanyspaces", 8);
+        assert_eq!(l[0], "a");
+        assert!(l.iter().all(|x| x.chars().count() <= 8), "{:?}", l);
+    }
+}
 
 fn mmss(t: f32) -> String {
     let t = t.max(0.0) as i32;
@@ -1149,12 +1173,13 @@ impl Ui {
             let ti = tool_info(t);
             let tcols = 34.min(cols as usize);
             let mut lines: Vec<(String, Color)> = wrap(&ti.desc, tcols - 4).into_iter().map(|l| (l, TXT)).collect();
+            // every line wraps; the window grows with the lines
             let cost = tool_cost(t, g);
             if !cost.is_empty() {
-                lines.push((trf("ui.cost", &[cost]), GOLD));
+                lines.extend(wrap(&trf("ui.cost", &[cost]), tcols - 4).into_iter().map(|l| (l, GOLD)));
             }
             if !touch_ui() {
-                lines.push((trf("ui.key", &[keys[i].clone()]), DIM));
+                lines.extend(wrap(&trf("ui.key", &[keys[i].clone()]), tcols - 4).into_iter().map(|l| (l, DIM)));
             }
             let rows = lines.len() as i32 + 2;
             let anchor = if touch_ui() { sw * 0.5 } else { mx };