Feature request: Make errors copyable

[jwbth]

VS Code now allows to copy error text: https://code.visualstudio.com/updates/v1_106#_copy-diagnostic-hover-text. I suppose the use cases are obvious.

The fact that JS errors are displayed with formatting thanks to this extension doesn't mean you shouldn't be able to copy it in the original format.

In fact, it's even more relevant for formatted errors, because when this

is copied manually, newlines end up in the text:

Type 
 boolean 
 is not assignable to type 
 string 
 .

which is not the case with plain text.

[kevinramharak]

Duplicate of #29.
Also see docs/hide-original-errors.md#making-type-blocks-copyable.

I did not expect the type blocks to be copyable, but I guess they are and just don't show the selection. Or it might have changed since that issue. I did look into this a few weeks ago, after I saw that feature added, but the original issue that requires the codeicon hack to display a background color still exists.

We could add a similar button, but I don't see the added value, unless you have the original error text hidden. There seems to be no API to intercept the copy action, so the best we can do is implement an identical button that writes the unformatted error to the clipboard.