File casing issue with rename

[ghost]

Issue Type: Bug

Moving from microsoft/TypeScript#28401

• Test on windows in a project with no tsconfig.json.
• a.ts: import { b } from "./B";
• b.ts: export const b = 0;
• Open just a.ts.
• Rename b to bee.
• Vscode will open a new tab B.ts.
• Click on b.ts in the file explorer. Now b.ts and B.ts are open side-by-side.

Expected behavior:

There is no b.ts B.ts distinction on windows.

Actual behavior:

There is and we have two duplicate files.

VS Code version: Code - Insiders 1.29.0-insider (5438af1, 2018-11-07T01:01:54.305Z)
OS version: Windows_NT x64 10.0.17134

System Info

Item	Value
CPUs	Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50GHz (8 x 3492)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: unavailable_software video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	15.91GB (9.21GB free)
Process Argv	.
Screen Reader	no
VM	0%

Extensions: none

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Same file opened twice with different filename casing (#20594)

[ghost]

Duplicate of #12448