RFC: Show background fetch status in bottom line

[stefanhaller]

• PR Description

RFC: Show background fetch status in bottom line

This shows a status as if the user had typed 'f' manually in the files panel.

I want this particularly for the first fetch after startup. There are often
situations where I need to wait for this first background fetch to be done
before I can do what I want (e.g. rebase my branch onto its base branch, or
check out a branch that my coworker has told me they just pushed), but currently
it's hard to tell when that is.

I'm not sure yet if the status for every subsequent background fetch after the
first one is distracting, and I would also be fine with only displaying it for
the initial one.

Or maybe we can come up with some other place in the UI that can show
background activities, that would also be fine with me. I don't have a good
idea myself where that could be though.

[codacy-production]

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	Coverable lines	Covered lines	Coverage
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Head commit (abfea47)	52029	44988	86.47%

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	Coverable lines	Covered lines	Diff coverage
Pull request (#4215)	3	0	0.00%

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[jesseduffield]

I quite like the idea of just showing it every time, because often it causes a slight delay in some action I want to perform and it would be good to actually see the reason why.

As for location, I'm fine with it at the bottom. It may be a little bit annoying for users who are hiding their bottom line (because it shows up again and slightly squashes the other panels when something is loading). We've got a separate issue for that here: #4189

[stefanhaller]

Ok cool. Does that mean we can merge this as is (after rewording the commit message a bit)?

Did you see the change in the first commit? I'm not entirely sure about it, see commit message for details.