[Feature]: better handling `Ctrl-backspace` for CJK texts

[NewUserHa]

Summary / problem statement. Proposed solution

example:

这是一个测试abc

result after pressing Ctrl-backspace in notepad3:

result after pressing Ctrl-backspace in windows notepad / browser / chrome:

这是一个测试

The behavior in windows notepad / browser / chrome is expected and more ergonomic.

version: 7.26.426.1

Scope (best guess)

No response

Confirmation

• I searched existing issues and this is not a duplicate.
• This isn't already configurable via an INI key or command-line switch.