Add blame view link for supported platforms ...

[keevan]

for all the bits and bobs (current line, selection, file, etc).

Seems like it will mainly be the same as the standard link with the additional blame information.

Since this opens a view with the file content in plain text. Perhaps it would be useful to have this as the fallback method for platforms where the plaintext view option is not available, assuming a blame view exists for it.

• Add blame view link support (similar to current link)
• Think about adding support for this in the command-palette. It may be easy as just another option in the palette for now.