Word selection is too coarse, doesn't stop at non-letter characters #5023

Currently, editing and selecting text, like expressions or file paths, in the PowerShell REPL is quite cumbersome because only letters (Regex \w character group) are considered word boundaries.

I would expect the cursor to stop at the next non-letter (Regex \W character group) character when navigating using CTRL + LEFT/RIGHT ARROW.

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.

Screenshot

Environment data

PS Version: 7.5.4
PS HostName: ConsoleHost
PSReadLine Version: 2.3.6
PSReadLine EditMode: Windows
OS: 10.0.19041.4406 (WinBuild.160101.0800)
BufferWidth: 120
BufferHeight: 9001

Steps to reproduce

1. Enter a text like the one from the screenshot into a PowerShell window:
   Out-File '.\Temp\Test.csv'
2. Move the cursor using CTRL + LEFT/RIGHT ARROW keys

Expected behavior

Pressing CTRL + SHIFT + LEFT/RIGHT ARROW keys, I'd expect text selection to switch from Temp... to \Temp..., then .\Temp..., '.\Temp..., File '.\Temp... etc.

Actual behavior

Pressing CTRL + SHIFT + LEFT/RIGHT ARROW keys, text selection switches from Temp... to File '.\Temp... etc.