Description

The current <Plus>MarkdownPlusListBackspace can only handle one-byte charcter. If the charcter is multi-byte, it will only delete the last byte.

Steps to Reproduce

1. Use the default keymaps.
2. Enter a multi-byte charcter, such as 。, whose utf8 code is %E3%80%82.
3. Press <BS> in insert mode.

Expected Behavior

。 be deleted.

Actual Behavior

Only the last byte was deleted. It become %E3%80.

Environment

• Neovim version: 0.11.5
• Plugin version: 7d0d052
• OS: Linux

Additional Context

Any other information, screenshots, or error messages.