Fix Jump to next unresolved thread
What does this MR do?
Relates to #199730 (closed)
When clicking the "Jump to next unresolved discussion" from within a discussion it does not take into account which discussion is being "jumped from". The easiest way to see this is to create an MR with two or more discussions. Then click the "next" button from the first discussion. It will try to jump to itself because it has not tracked any history yet, so it thinks the first discussion is the "next" discussion.
What should happen is that it jumps to the second discussion. This MR fixes that behavior.
Screenshots
The offending button
The incorrect behavior caught in the act!
The much better behaving behavior.
