Regression: Down-arrow on last input line no longer jumps to end of line

Claude Code version: 2.1.172
Platform: macOS 15.6.1 (arm64)
Terminal: tmux 3.5a (TERM=screen-256color)

What changed

In a previous version, pressing the Down arrow key while the cursor was on the last line of the input buffer would move the cursor to the end of that line. This was a very useful, frequently-used shortcut.

In version 2.1.172 this behavior is gone — Down-arrow on the last line no longer jumps to end-of-line.

Expected behavior

Pressing Down arrow while on the last line of input moves the cursor to the end of the line (mirroring how Up-arrow on the first line jumps to the beginning of the line).

Actual behavior

Down-arrow on the last line no longer moves to end-of-line.

Impact

Loss of a small but high-frequency editing convenience. Please reconsider and restore this behavior.