Reload local branches list on tab activation

[Dmitry Kasatsky]

Some branches can be checked out in working trees (in another tabs or outside Cong), Working tree checkout markers become invalid when returning to the original tab. See #164

[Evgeny Kralko]

We need to rework Equals() condition for the correct refresh.

public override bool Equals(object obj)
{
    return obj is Branch other
        ? CompareTo(other) == 0 && IsCurrent == other.IsCurrent
        : base.Equals(obj);
}

‌

[Dmitry Kasatsky]

fix #165, Equality of branches based on path and status, unit tests

→ <<cset 960c2a4cb98f>>

[Evgeny Kralko]

Merged in bugfix/#165-0.1.3 (pull request #100)

fix #165, Equality of branches based on path and status, unit tests

Approved-by: Evgeny Kralko [e-mail]

→ <<cset a925acf555f9>>