fix for GRAILS-6078 "Plugins that use pluginContextPath explicitly don't work in 1.2.x due to duplication of pluginContextPath"

Author: graemerocher

src/java/org/codehaus/groovy/grails/plugins/web/taglib/RenderTagLib.groovy

@@ -472,19 +472,23 @@ class RenderTagLib implements com.opensymphony.module.sitemesh.RequestConstants
         def engine = groovyPagesTemplateEngine
         def uri = grailsAttributes.getTemplateUri(attrs.template,request)
         def var = attrs['var']
-        def contextPath = attrs.contextPath ? attrs.contextPath : null
-        
-        if(attrs.plugin) {
-            contextPath = pluginManager?.getPluginPath(attrs.plugin) ?: ''
-        }
-        else if (contextPath == null) {
-            contextPath = pageScope.pluginContextPath ?: ""
-        }
 
         Template t = TEMPLATE_CACHE[uri]
 
-        def templatePath = "${contextPath}${uri}"
         if(t==null) {
+            def contextPath = attrs.contextPath ? attrs.contextPath : null
+            		                    
+            if(attrs.plugin) {
+                contextPath = pluginManager?.getPluginPath(attrs.plugin) ?: ''
+            }
+            else if (contextPath == null) {
+            	if(uri.startsWith("/plugins/")) contextPath = ""
+            	else {
+            		contextPath = pageScope.pluginContextPath ?: ""
+            	}            
+            }
+            def templatePath = "${contextPath}${uri}"
+        	
             t = engine.createTemplateForUri([templatePath, "${contextPath}/grails-app/views/${uri}"] as String[])
 			  if(!engine.isReloadEnabled() && t!=null) {
 				  def prevt = TEMPLATE_CACHE.putIfAbsent(uri, t)