Fix eternal season affect on weather #54100
Merged
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Summary
Bugfixes "Make eternal season option affect weather and water temperature"
Purpose of change
Fixes #26756.
Also fixes a similar bug related to seasonal water temperature.
Describe the solution
Use the same trick as I previously used for the sunlight angle in eternal season mode where it just repeats the same weather from the first game day. A twist here is that we still use the true timestamp for the simplex noise parameter, because otherwise the weather would be exactly the same from day to day.
Describe alternatives you've considered
Could take it more literally and match the start season rather than the start day, allowing for some additional variation. But it's not clear to me how to achieve that.
Testing
I added a new unit test to check this case.
Additional context