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Fixed in 2019.1.X
Canvas Group children with Canvas component are faded when changing Alpha parameter in the Canvas Group
How to reproduce:
1. Open the attached Test.zip project
2. In the Hierarchy window expand Canvas and select Canvas group
3. Go to Inspector window -> Canvas Group -> Alpha
4. Decrease Alpha from 1 to 0.5 and then to 0 to see that the Image with Canvas is not fading
Expected: Canvas Group children with Canvas component are faded
Actual: Canvas Group children with Canvas component aren't faded
Reproducable with: 2018.3.0a11, 2018.3.0b5, 2019.1.0a3
Not reproducable with: 2017.4.12f1, 2018.1.9f2, 2018.2.11f1, 2018.0a10
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Mar 06, 2019 04:18
Yes, please backport this to 2018.3.X.
I wanted to upgrade to 2018.3.7 following the news of the remote code execution security warning, but this bug is just gonna break so much of our UI.
Feb 25, 2019 02:42
Come on, Unity. Please backporting this to Unity2018.3.X. If not, so many projects could not be use Unity2018.3.X.
This issue is a very serious and used common case. For example, split canvas and simply control show/hide. Strategy fo split canvas also useful render together Particle System, SpriteRenderer. So so many common logic have to be change, there are not a simply solver.
I have a some dirty solving way that link CanvasGroup like chain(What the!), and use it before we decide to upgrade Unity 2019.X(of course, I thought we can not upgrade before be regular stage). But in this case also have a lot of problem in case by case.