Expand type alias for completion provider

[cdce8p]

Match type alias from completion provider with hover provider. The type alias will only be expanded if the completion item is the alias itself to preserve readability.

See: microsoft/pylance-release#562

pyright/packages/pyright-internal/src/languageService/hoverProvider.ts

Lines 161 to 174 in 51ad4c2

	// Determine if this identifier is a type alias. If so, expand
	// the type alias when printing the type information.
	const type = evaluator.getType(typeNode);
	let expandTypeAlias = false;
	if (type && TypeBase.isInstantiable(type)) {
	const typeAliasInfo = getTypeAliasInfo(type);
	if (typeAliasInfo) {
	if (typeAliasInfo.aliasName === typeNode.value) {
	expandTypeAlias = true;
	}
	label = 'type alias';
	}
	}

[erictraut]

This change looks good to me, but a unit test should be added for it.

[cdce8p]

I've added a unit test

[erictraut]

Thanks for the contribution. Merging.