same file on different paths

[schmeic]

• VSCode Version: 1.45.1
• OS Version: Linux Mint 19.3

Steps to Reproduce:

1. Say I have ~/app1/test.ts
2. And a symlink ~/app2 -> ~/app1
3. Open ~/app1/test.ts
4. Open ~/app2/test.ts side by side
5. Start typing in ~/app1/test.ts - nothing changes in the ~/app2/test.ts editor
6. Save ~/app1/test.ts - now the changes appear in ~/app2/test.ts
7. I would expect this to behave the same as if I split an editor, it's the same file. So, typing in one editor should immediately update the other editor.
8. Also, if I set "workbench.editor.revealIfOpen": true, I would expect trying to open ~/app2/test.ts would just use ~/app1/test.ts.

Does this issue occur when all extensions are disabled?: Yes/No
Yes

[bpasero]

/duplicate #12448