fix(v15): loaders for styles are not deduplicated when experiments.css is true

[xc2]

related web-infra-dev/rsbuild#2093

cause:

genRequest who does the deduplicating is not called for the branch for experiments.css === true

vue-loader/lib/loaders/pitcher.js

Lines 126 to 161 in 96a7493

	if (isWebpack5 && this._compiler.options.experiments && this._compiler.options.experiments.css) {
	// If user enables `experiments.css`, then we are trying to emit css code directly.
	// Although we can target requests like `xxx.vue?type=style` to match `type: "css"`,
	// it will make the plugin a mess.
	if (!options.experimentalInlineMatchResource) {
	this.emitError(
	new Error(
	'`experimentalInlineMatchResource` should be enabled if `experiments.css` enabled currently'
	)
	)
	return ''
	}
	if (query.inline || query.module) {
	this.emitError(
	new Error(
	'`inline` or `module` is currently not supported with `experiments.css` enabled'
	)
	)
	return ''
	}
	const loaderString = [stylePostLoaderPath, ...loaders]
	.map((loader) => {
	return typeof loader === 'string' ? loader : loader.request
	})
	.join('!')
	const styleRequest = loaderUtils.stringifyRequest(
	this,
	`${this.resourcePath}${query.lang ? `.${query.lang}` : ''}${
	this.resourceQuery
	}!=!-!${loaderString}!${this.resourcePath + this.resourceQuery}`
	)
	return `@import ${styleRequest};`
	}