fix: wrap explorer root paths in narrow panes

src/tui.rs

@@ -26,7 +26,7 @@ use ratatui::{
     layout::{Constraint, Layout, Position, Rect},
     style::{Color, Modifier, Style},
     text::{Line, Span},
-    widgets::{Block, Borders, Clear, Paragraph},
+    widgets::{Block, Borders, Clear, Paragraph, Wrap},
 };
 use unicode_segmentation::UnicodeSegmentation;
 use unicode_width::UnicodeWidthStr;
@@ -2263,9 +2263,22 @@ fn draw_file_list(
     let show_root = content.height >= 4 && !picker.root.as_os_str().is_empty();
     let show_error = picker.error.is_some() && content.height >= 2;
     let show_help = content.height >= 5 + u16::from(show_error);
+    let root = show_root.then(|| {
+        Paragraph::new(display_text(&picker.root.to_string_lossy()))
+            .style(Style::default().fg(Color::DarkGray))
+            .wrap(Wrap { trim: false })
+    });
+    // Reserve the query, optional notices/footer, and at least one file row.
+    let root_rows = root.as_ref().map_or(0, |root| {
+        root.line_count(content.width).min(usize::from(
+            content
+                .height
+                .saturating_sub(2 + u16::from(show_error) + u16::from(show_help)),
+        )) as u16
+    });
     let [query_area, root_area, error_area, results_area, help_area] = Layout::vertical([
         Constraint::Length(1),
-        Constraint::Length(u16::from(show_root)),
+        Constraint::Length(root_rows),
         Constraint::Length(u16::from(show_error)),
         Constraint::Fill(1),
         Constraint::Length(u16::from(show_help)),
@@ -2304,12 +2317,8 @@ fn draw_file_list(
         let cursor_x = if browsing { 0 } else { query_width - offset };
         frame.set_cursor_position((query_area.x + cursor_x as u16, query_area.y));
     }
-    if show_root {
-        frame.render_widget(
-            Paragraph::new(display_text(&picker.root.to_string_lossy()))
-                .style(Style::default().fg(Color::DarkGray)),
-            root_area,
-        );
+    if let Some(root) = root {
+        frame.render_widget(root, root_area);
     }
     if show_error {
         frame.render_widget(
@@ -5824,6 +5833,34 @@ end
         assert_eq!(buffer[(1, selected_y)].bg, Color::Blue);
     }
 
+    #[test]
+    fn explorer_wraps_only_root_path_and_reserves_file_rows_in_short_panes() {
+        let root = "/a/very/long/path/to/project/root";
+        let picker = FilePicker::from_paths(root.into(), [(0, "entry.txt".into())]);
+        let mut terminal = Terminal::new(ratatui::backend::TestBackend::new(20, 12)).unwrap();
+        let mut panels = WheelPanels::default();
+        terminal
+            .draw(|frame| draw_file_list(frame, &picker, frame.area(), "", &mut panels, None))
+            .unwrap();
+        let buffer = terminal.backend().buffer();
+        let path = (2..4)
+            .map(|y| (1..19).map(|x| buffer[(x, y)].symbol()).collect::<String>())
+            .collect::<String>();
+        assert_eq!(path.trim_end(), root);
+        assert!(
+            screen_text(&terminal)
+                .lines()
+                .nth(4)
+                .unwrap()
+                .contains("entry.txt")
+        );
+        terminal.backend_mut().resize(20, 6);
+        terminal
+            .draw(|frame| draw_file_list(frame, &picker, frame.area(), "", &mut panels, None))
+            .unwrap();
+        assert!(screen_text(&terminal).contains("entry.txt"));
+    }
+
     #[test]
     fn list_footers_show_remapped_and_disabled_selection_keys() {
         let mut editor = Editor::open(None, vec![]).unwrap();