g:createLink resource="" should allow specifying contollerName

[codeconsole]

Given the following:

class Sample {
    String name
}

class Sample2Controller {
    static scaffold = Sample
}

all the links should work, but they don't. They all end up pointing to /sample/$action

this is due to the resource option in links. This could be fixed by also allowing to override resource with controllerName, but does not perform as expected..

[codeconsole]

grails-gsp/grails-plugin-gsp/src/main/groovy/org/grails/plugins/web/taglib/ApplicationTagLib.groovy

Lines 358 to 386 in cae0d81

	Closure createLink = { attrs ->
	return doCreateLink(attrs instanceof Map ? (Map) attrs : Collections.emptyMap())
	}
	@CompileStatic
	protected String doCreateLink(Map attrs) {
	Map urlAttrs = attrs
	if (attrs.url instanceof Map) {
	urlAttrs = (Map)attrs.url
	}
	Map params = urlAttrs.params && urlAttrs.params instanceof Map ? (Map)urlAttrs.params : [:]
	HttpServletRequest req = (HttpServletRequest)getProperty('request')
	HttpServletResponse res = (HttpServletResponse)getProperty('response')
	def flowExecutionKey = req.getAttribute('flowExecutionKey')
	if (flowExecutionKey) {
	if (attrs.controller == null && attrs.action == null && attrs.url == null && attrs.uri == null) {
	urlAttrs[LinkGenerator.ATTRIBUTE_ACTION] = GrailsWebRequest.lookup().actionName
	}
	}
	if (urlAttrs.event) {
	params."_eventId" = urlAttrs.remove('event')
	urlAttrs.params = params
	}
	String generatedLink = linkGenerator.link(urlAttrs, req.getAttribute('characterEncoding')?.toString())
	generatedLink = processedUrl(generatedLink, req)
	return useJsessionId ? res.encodeURL(generatedLink) : generatedLink
	}

[codeconsole]

This is due to a bug in:
https://github.com/grails/grails-core/blob/da8668daa13c9c1b2157535e11986f49615e8a4b/grails-web-url-mappings/src/main/groovy/org/grails/web/mapping/DefaultLinkGenerator.groovy#L169-L192