The three rebase options are
1. Rebase on parent change
2. Rebase on top of the <branch name> branch
3. Rebase on a specific change or ref
Scenarios:
Has parent, can rebase on parent
- Show all 3 options. Second two options show "breaks relation chain"
message.
Has parent, can't rebase on parent
- Instead of option 1, show message that is up to date with parent.
- Show second two options with "breaks relation chain" message.
Has no parent, can rebase on parent (tip of branch)
- Do not show option 1, nor dipslay message in its place.
- Show second two options without "breaks relation chain" message.
Has no parent, can't rebase on parent (tip of branch)
- Do not show option 1, nor dipslay message in its place.
- Instead of option, show message that change is up to date with tip of
branch already
- Show option 3 without "breaks relation chain" message.
Because 'hasParent' isn't immediately known when change actions are
displayed, the rebase button will also remain disabled until this
becomes known.
Bug: Issue 5447
Change-Id: I45ef8241a75c1f5d197ed64e51b19c5ce74d0227
61ecc0cf10