Put selected branch first in picker

[rnystrom]

h/t again to @BrianLitwin for the great branch switching feature! I love it!

I'd love if we could show sort the branches w/ the currently selected branch first. Only on init though, it shouldn't resort when you select.

Also, master (or the repo's default branch) should be the 2nd option. Or maybe the right bar button item is "Default" and auto selects the default branch?

[rnystrom]

@BrianLitwin wanna take this?

[BrianLitwin]

Does this look good?

func test_branchesOrderAfterFetch() {
        let branches = [
            "master",
            "branch_1",
            "branch_2",
            "branch_3",
            "branch_4"
        ]
        
        var output = RepositoryBranchesViewController.arrangeBranches(
            selectedBranch: "master",
            defaultBranch: "master",
            branches: branches
        )
        
        XCTAssertEqual(output[0], "master")
        XCTAssertEqual(output[1], "branch_1")
        
        output = RepositoryBranchesViewController.arrangeBranches(
            selectedBranch: "branch_2",
            defaultBranch: "branch_3",
            branches: branches
        )
        
        XCTAssertEqual(output[0], "branch_2")
        XCTAssertEqual(output[1], "branch_3")
    }

[rnystrom]

@BrianLitwin looks perfect!

[Huddie]

^ should be closed?

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