Prevent project groups from containing configuration settings

src/base/api.lua

@@ -149,7 +149,9 @@
 		api._clearChildScopes(cc)
 
 		-- activate the container, as well as its ancestors
-		api.scope.current = container
+		if not cc.placeholder then
+			api.scope.current = container
+		end
 		while container.parent do
 			api.scope[container.class.name] = container
 			container = container.parent

src/base/solution.lua

@@ -23,6 +23,7 @@
 	p.api.container {
 		name = "group",
 		parent = "solution",
+		placeholder = true,
 	}