Fix z-index bug, context clean up bug

Author: adamwathan

src/corePlugins/zIndex.js

@@ -4,7 +4,7 @@ const { asValue } = require('../pluginUtils')
 module.exports = function ({ matchUtilities, jit: { theme } }) {
   matchUtilities({
     z: (modifier, { theme }) => {
-      let value = asValue(modifier, theme.scale)
+      let value = asValue(modifier, theme.zIndex)
 
       if (value === undefined) {
         return []

src/lib/generateRules.js

@@ -1,5 +1,6 @@
 const postcss = require('postcss')
 const { default: parseObjectStyles } = require('tailwindcss/lib/util/parseObjectStyles')
+const { transformAllSelectors } = require('../pluginUtils')
 const { toPostCssNode, isPlainObject } = require('./utils')
 
 // Generate match permutations for a class candidate, like:

src/lib/setupContext.js

@@ -600,7 +600,7 @@ function setupContext(configOrPath) {
     if (contextMap.has(sourcePath)) {
       let oldContext = contextMap.get(sourcePath)
       if (contextSourcesMap.has(oldContext)) {
-        contextSourcesMap.get(oldContext).remove(sourcePath)
+        contextSourcesMap.get(oldContext).delete(sourcePath)
         if (contextSourcesMap.get(oldContext).size === 0) {
           contextSourcesMap.delete(oldContext)
           cleanupContext(oldContext)