Merge #3388

Merge #3388

3388: Remove inlay hint in diff views r=matklad a=vbfox

If the left side of a diff view that contain the old version of the file apply inlays they are misplaced and produce a weird display:

![image](https://user-images.githubusercontent.com/131878/75628802-b1ac1900-5bdc-11ea-8c26-6722d8e38371.png)

After the change:

![image](https://user-images.githubusercontent.com/131878/75628831-e91ac580-5bdc-11ea-9039-c6b4ffbdb2be.png)

The detection is done by blacklisting the url schemes used by git and subversion scm extensions, whitelisting `file` is also possible but neither is perfect as VSCode now support both pluggable scm extensions and pluggable remote filesystems. But I suspect that the list of scm extensions is more easily manageable.

**Note**: I can rebase on #3378 if needed as it touches the same lines of code

Co-authored-by: Julien Roncaglia <julien@roncaglia.fr>