Backslashes not recognized in Project Search "Files to Include" especially when pasted from "Copy Relative Path"

[FirstVertex]

Issue Type: Bug

1. Windows 10, open your favorite project with deep filestructure
2. Go to subfolder of project, right click it, choose "copy relative path"
3. move to Search tab (Shift + Ctrl + F)
4. paste relative path from step 2 into "files to include"
5. notice the path has "backslashes" \
6. search for something
7. notice there are zero results
8. change all the backslashes in "files to include" to forward slashes /
9. notice the search results populated

Observed: The path pasted from "copy relative path" command has backslashes, but the Project Search function didn't recognize backslashes

Expected: Can we please standardize on the right kind of slashes for my OS, or just recognize any kind of slashes?

VS Code version: Code 1.41.1 (26076a4, 2019-12-18T14:58:56.166Z)
OS version: Windows_NT x64 10.0.17134

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz (8 x 2112)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: disabled_off protected_video_decode: enabled rasterization: enabled skia_renderer: disabled_off surface_control: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: enabled_on viz_hit_test_surface_layer: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.88GB (6.40GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (2)

Extension	Author (truncated)	Version
EditorConfig	Edi	0.14.4
docthis	joe	0.7.1

[shogerr]

This is probably the desired behavior. On Windows, you have to remember they are the odd duck out with back slashes for paths. The search probably, and correctly, uses the backslash as an escape character. Try using '\\' to search for a back slash, and see if that works. Again, if this is the behavior, this is going to be intentional, and desirable.

What's broken here is Windows, and not VSCode.