Disable writing to alpha with opaque framebuffer #61375
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Fixes: #61363
Might fix: #61359
The issue here is that transparent objects were writing to the alpha channel of the framebuffer which used to be ignored when not using a transparent viewport. Now that the post-process doesn't ignore transparency, the final viewport becomes transparent when transparent objects are used. This PR makes it so transparent objects no longer write to the alpha channel during normal rendering when using an opaque viewport.