BackwardKillWord will delete two word

[mrbeardad]

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

N/A

Screenshot

N/A

Environment data

Set-PSReadLineKeyHandler -ViMode Insert -Key Ctrl+w -Function BackwardKillWord

Steps to reproduce

1. type test --
2. press ctrl-w
3. test -- are both deleted

Expected behavior

Only delete the -- or -- but keep test which is before <space>

Actual behavior

ctrl-w will delete the both two word test and --