Language guessing: Allow paste contents to override `files.defaultLanguage`?

Speaking with @sbatten it was griped that the “paste contents into an untitled editor to set the language to the paste source” flow doesn’t work when you have files.defaultLanguage configured. This is intentional AFAIK but maybe worth revisiting? Relevant code:

https://github.com/microsoft/vscode/blob/33c614d11a561bfac4061cdb5f24dc4215c62e9e/src/vs/workbench/browser/parts/editor/textResourceEditor.ts#L165-L220

cc @TylerLeonhardt @bpasero

[sbatten]

in the base case of this issue, we know exactly the language because it comes from an existing file. We don’t rely on the model in this case.

[Tyriar]

👍 to configurable, I paste far more into untitled markdown files than anything else and sometimes I start with pasting code before wrapping it in backticks. Since I’m comfortable with the change language keybinding I prefer to do that in the off chance I need it. If we do make it configurable I’d suggest just making a separate setting and not have the language detection code consider the default language setting at all.