Merge request should only show diff for topic, not previous topics
For the following topology of changesets : * [draft] (topic-2) add topic-2 feature * [draft] (topic-1) add topic-1 feature * [public] initial commit When pushed to heptapod, two merge requests can be created. The first one is fine, only the diff for topic-1 is there. For the second one it show both topic-2 and topic-1. It would be nice if it could only show topic-2. A tricky part of this is then when I click merge on topic-2 one might expect to have: * [draft] (topic-1) add topic-1 feature * [public] (topic-2) add topic-2 feature * [public] initial commit
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