Task Description

Currently, the multi-threading decreases the runtime performance by 100% percent. Therefore, it is disabled for now, except for one test.

The basis for the constraint multi-threading was created here.

Tasks

[ ] Log warning about experimental feature via Dem, when ConstraintMultiThreading is true.
[ ] Every thread should have a name, so these are easier to understand in the debugger.
[ ] First complete this ticket.
[ ] Try improving multi-threading of constraint nodes by grouping additions and removals together.
- [ ] Do not reset rating cache too often
- [ ] Ensure calling Constraint#rating implicitly at end of line group update.
  - [ ] How to ensure the constraint node is synchronized to its parents, too?
[ ] Create integration test for multi-threading.
- [ ] Document, that only test multi-threading in integration and fuzzy tests. Basic concurrency tests should be done in normal tests.
[ ] Improve constraint performance, by only using dedicated thread for constraint nodes, that have more than 2 children.
[ ] Consider analysis, that states which thread worked at which constraint node.
[ ] Make editor working faster via multi-threading.
- [ ] Prevent lock up of edtior via multi-threading.