Fix display of wrapped lines at file end

e2e/test_wrapping.py

@@ -176,6 +176,36 @@ def test_scroll_up_into_wrapped_line():
         os.unlink(path)
 
 
+def test_last_line_wrapped_visible():
+    long_line = "x" * 120
+    other_lines = "\n".join(str(i) for i in range(1, 10))
+    file_content = f"{other_lines}\n{long_line}\n"
+    fd, path = tempfile.mkstemp()
+    try:
+        with os.fdopen(fd, "w") as f:
+            f.write(file_content)
+
+        env = os.environ.copy()
+        env.setdefault("TERM", "xterm")
+        child = pexpect.spawn(EVI_BIN, [path], env=env, encoding="utf-8")
+        child.delaybeforesend = float(os.getenv("EVI_DELAY_BEFORE_SEND", "0.1"))
+        child.setwinsize(10, 60)
+
+        get_screen_and_cursor(child)
+        child.send("j" * 9)
+        screen, _ = get_screen_and_cursor(child)
+        lines = _parse_screen(screen)
+
+        x_rows = [row for row, text in lines.items() if text.startswith("x")]
+        assert len(x_rows) == 2
+        assert sum(len(lines[row]) for row in x_rows) == 120
+
+        child.send(":q!\r")
+        child.expect(pexpect.EOF)
+    finally:
+        os.unlink(path)
+
+
 # def test_full_width_lines_no_extra_blank_lines():
 #     file_content = "{}\n{}\n{}\n".format("A" * 80, "B" * 80, "C" * 80)
 #     fd, path = tempfile.mkstemp()

src/command/commands/move_cursor.rs

@@ -155,8 +155,27 @@ impl Command for NextLine {
 
             editor.cursor_position_in_buffer.row = next_row;
 
-            // 目的の列に移動
+            // Ensure the entire current line is visible. If the line would
+            // extend beyond the bottom of the screen, scroll the window up
+            // until it fits (leaving at least one blank line after it).
             let next_line = &editor.buffer.lines[editor.cursor_position_in_buffer.row];
+            let mut next_line_height =
+                get_line_height(next_line, editor.terminal_size.width) as u16;
+            while editor.cursor_position_on_screen.row + next_line_height
+                >= editor.content_height()
+                && editor.window_position_in_buffer.row + 1 < editor.buffer.lines.len()
+            {
+                let first_line = &editor.buffer.lines[editor.window_position_in_buffer.row];
+                let first_line_height =
+                    get_line_height(first_line, editor.terminal_size.width) as u16;
+                editor.window_position_in_buffer.row += 1;
+                editor.cursor_position_on_screen.row = editor
+                    .cursor_position_on_screen
+                    .row
+                    .saturating_sub(first_line_height);
+            }
+
+            // 目的の列に移動
             let num_of_chars_of_next_line = next_line.chars().count();
             let destination_col = if current_cursor_col_in_buffer > num_of_chars_of_next_line {
                 num_of_chars_of_next_line