ensure v-if/v-for priority (fix #2573)

src/directives/priorities.js

@@ -5,6 +5,6 @@ export const TRANSITION = 1100
 export const EL = 1500
 export const COMPONENT = 1500
 export const PARTIAL = 1750
-export const FOR = 2000
-export const IF = 2000
-export const SLOT = 2100
+export const IF = 2100
+export const FOR = 2200
+export const SLOT = 2300