Invalidate stylesheet cache if applies increase cache size

Author: adamwathan

src/lib/expandApplyAtRules.js

@@ -18,9 +18,15 @@ function expandApplyAtRules(context) {
 
     // Start the @apply process if we have rules with @apply in them
     if (applies.length > 0) {
+      let classCacheCount = context.classCache.size
+
       // Fill up some caches!
       generateRules(context.tailwindConfig, applyCandidates, context)
 
+      if (context.classCache.size > classCacheCount) {
+        context.stylesheetCache = null
+      }
+
       /**
        * When we have an apply like this:
        *