Allow scc providers hide commit input box.

[IlyaBiryukov]

Fix for #51808.

[joaomoreno]

Review notes:

1. There already is a SourceControlInputBox object in the API. This feature should just be a visible property on that object.
2. The current implementation doesn't actually react on changes to that visible property, it just relies on the value when the SCM repository gets rendered, which is sub-optimal.

I've addressed both these issues and merged this in: f1f5385

Thanks! 🍻

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@jrieken Sorry for sidelining this, but this introduces a new proposed API: one which allows to hide a source control provider's input box. Let me know if you want me to bring it up for review in the API call. Here's the signature:

https://github.com/Microsoft/vscode/blob/f1f5385a68bfab396232054a3bb573aa16a05e1d/src/vs/vscode.proposed.d.ts#L729:L738

[jrieken]

It's OK if it is just proposed but I find the scenario rather weird and LS specific. Would a real source control provider ever want to hide its input field? Should this be linked with the fact that the file system in readonly and then the main side automagically hides/disables the input box?

[jrieken]

fyi - this has caused #61676 and the merge has been reverted

[joaomoreno]

@jrieken Thanks for jumping on it.

🤦‍♂️ e337569

I am embarrassed.