Make power_preference_from_env() respect WGPU_POWER_PREF=none #4076
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Also update wgpu/README.md now that default() is None.
Checklist
cargo clippy
.cargo clippy --target wasm32-unknown-unknown
if applicable.Description
Respecting
WGPU_POWER_PREF=none
makes no difference to wgpu testing and examples, as the fallback is alreadydefault()
(which isPowerPreference::None
), but makes a difference to other projects which for instance uses the logic "check for WGPU_POWER_PREF in the env, otherwise use high power".Also updates
wgpu/README.md
to reflect that the default is nowNone
.Testing
Manually testing.