PSReadLine crashes with ArgumentOutOfRangeException on SetCursorPosition when quickly editing long input line (top=29, BufferHeight=29)

Tái hiện sự cố với BufferHeight 29, sau đó lần theo lệnh gọi SetCursorPosition được báo cáo qua MoveCursorToEnd trong quá trình làm mới bộ đệm console. Đảm bảo vị trí phía trên của con trỏ luôn nằm trong khoảng 0..BufferHeight-1 và xác minh rằng việc chỉnh sửa nhanh bằng Backspace rồi nhập tiếp không còn đóng phiên nữa.

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues, especially the pinned issues.

Exception report

# PSReadLine crashes with ArgumentOutOfRangeException on rapid Backspace editing

## Environment
- PowerShell: 7.x (console)
- PSReadLine version: 2.4.5
- Terminal: Windows Console host, BufferHeight = 29

## Bug description
Typing commands and rapidly pressing Backspace caused PSReadLine to crash with
`ArgumentOutOfRangeException` thrown from `SetCursorPosition`:


Exception:
System.Management.Automation.PSArgumentOutOfRangeException:
Cannot process argument transformation on parameter 'top'.
Parameter name: 'top' cannot be greater than '29'


## Reproduction steps
1. Open a PowerShell console with a short window (BufferHeight ~29).
2. Type `vine update`, then `vine inventory`.
3. Press Backspace ~13 times quickly to erase, retype `vine inventory`, press Enter.
4. Press `r` — crash occurs.

## Root cause analysis
- The reported cursor line index is `29`, which is out of the valid range `0..28`
  when BufferHeight == 29.
- The crash happened during input-line redraw after a burst of Backspace keys,
  suggesting PSReadLine's cursor position calculation went out of bounds
  (off-by-one at the bottom edge of the buffer).

## Notes
- This is not caused by the command itself — any command can trigger it when
  the buffer is short and Backspace is pressed rapidly.
- Suggested fix: clamp the cursor `top` coordinate to `[0, BufferHeight-1]`
  before calling `SetCursorPosition`.

## Reporter context
Found while testing **Vine** (https://codeberg.org/Milktown/vine), a
text-instruction-based package manager for Windows. It has nothing to do with
the crash, just FYI — Vine is a neat open-source project worth a look. :)

Screenshot

Environment data

PS Version: 7.6.3
PS HostName: ConsoleHost (Windows Terminal)
PSReadLine Version: 2.4.5
PSReadLine EditMode: Windows
OS: 10.0.19038.1 (WinBuild.160101.0800)
BufferWidth: 120
BufferHeight: 29

Steps to reproduce

Steps to reproduce

1. Open PowerShell with a window sized so console BufferHeight is exactly 29 (e.g. 80 columns x 29 rows)
2. Run: vine update
3. Run: vine inventory
4. Press Backspace 13 times rapidly (no text may remain, or partial)
5. Retype: vine inventory
6. Press Enter
7. Type a single character, e.g. r — crash happens on redraw

Expected behavior

Expected behavior

• Cursor line is clamped to valid range (0..BufferHeight-1); typing any character redraws the input line without errors

Actual behavior

Actual behavior

• PSReadLine throws ArgumentOutOfRangeException: top parameter (29) is out of valid range 0..28
• Stack: SetCursorPosition <- MoveCursorToEnd <- ... console buffer refresh; entire session crashes and closes