Temporarily don't initialize runtime files in buffer test

Adding InitRuntimeFiles() to buffer_test.go has changed the behavior
of this test: now it tests not just buffer editing per se, but also
how well buffer editing works together with syntax highlighting (since
InitRuntimeFiles() loads syntax files, and many of the test buffers
match the json header pattern in the json.yaml syntax file, so they are
"highlighted" as json). This revealed long existing races between
buffer editing and syntax highlighting.

Until we fix those races, temporarily disable InitRuntimeFiles() in this
test.

internal/buffer/buffer_test.go

@@ -20,7 +20,9 @@ type operation struct {
 
 func init() {
 	ulua.L = lua.NewState()
-	config.InitRuntimeFiles(false)
+	// TODO: uncomment InitRuntimeFiles once we fix races between syntax
+	// highlighting and buffer editing.
+	// config.InitRuntimeFiles(false)
 	config.InitGlobalSettings()
 	config.GlobalSettings["backup"] = false
 	config.GlobalSettings["fastdirty"] = true

internal/config/rtfiles.go

@@ -39,6 +39,10 @@ type RuntimeFile interface {
 var allFiles [][]RuntimeFile
 var realFiles [][]RuntimeFile
 
+func init() {
+	initRuntimeVars()
+}
+
 func initRuntimeVars() {
 	allFiles = make([][]RuntimeFile, NumTypes)
 	realFiles = make([][]RuntimeFile, NumTypes)