Problem:
GitHub was showing confusing label transitions like:
- 'added To Do Doing and removed To Do'
- 'added To Test Testing Done and removed Doing To Test Testing'
This occurred when issues had multiple state labels simultaneously
(due to bugs, manual edits, or failed transitions).
Root Cause:
The old transitionLabel() only removed the 'from' label and added
the 'to' label. If other state labels existed on the issue, they
would remain, causing messy multi-label states.
Solution:
1. Fetch the current issue to inspect all labels
2. Find ALL state labels on the issue (not just 'from')
3. Remove ALL state labels in a single operation
4. Add only the new 'to' label
This ensures atomic, clean transitions that display on GitHub as
a single 'removed X, added Y' operation, even if the issue
previously had multiple state labels.
Changes:
- GitHubProvider.transitionLabel(): Remove all state labels before adding new one
- GitLabProvider.transitionLabel(): Same fix for GitLab consistency
Addresses issue #97
c973c04635