The chat opacity option doesn't modify the chat opacity anymore in Minecraft 1.7.10 / Minecraft snapshot 14w33c.
Bug presents since Minecraft 1.7.
Someone found the problem I think:
This is possibly caused by GL_BLEND being disabled prior to a text render call.
Linked issues
is duplicated by 10
Comments 10
It is, I added it to my bugfix minimod and it worked.
Small oversight in cleaning up code from 1.6 probably.
@Gary Closse
Yes, this bug is present in the latest snapshot 14w25b
Notice that when you change the opacity slider, the grey background is faded as dictated by the setting, but the TEXT itself remains fully opaque.
Another test is to enter a chat message and let the chat window fade naturally. The background fades but the text does not fade with it and simply disappears.
Compare with 1.6.4 for proper function.
Confirmed.