Prepare remote url for specific branch

[BElluu]

• PR Description
  Before we always use "origin". Now I modified the operation to check the remote for a given branch, and based on the remote name, a remote URL is created. Fixed Unsupported git service (after renaming remote name) #3997

• Please check if the PR fulfills these requirements

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[BElluu]

Hi @stefanhaller. What do you think about this changes?

[stefanhaller]

I'm sorry, I never got around to looking at this, and then it fell through the cracks. (You don't have to wait a whole year to ping me in a case like this 😉)

Meanwhile we have another PR that does a similar thing (#4775), and your branch has the same problem as that one. See my comments there. The difference is that the other PR always uses the checked-out branch, whereas yours always uses the selected local branch; both is wrong, you need to use one or the other case by case (or the selected remote if we press o on a commit of a remote branch).

But the bigger problem for me is the shift-O feature, which I don't really understand. Changing code that affects this feature without understanding what exactly it does is a problem; see #4775 (comment).