Whitelist 4 new TextMate grammar fields (#4039)

pchaigno · Vicent Martí · commit fe3981ff03a6 · 2018-02-19T16:07:15.000+01:00
swallow, foregroundColor, and backgroundColor are older fields for TextMate 1.
diff --git a/tools/grammars/compiler/data.go b/tools/grammars/compiler/data.go
@@ -14,18 +14,22 @@ var GrammarAliases = map[string]string{
 }
 
 var KnownFields = map[string]bool{
-	"comment":            true,
-	"uuid":               true,
-	"author":             true,
-	"comments":           true,
-	"macros":             true,
-	"fileTypes":          true,
-	"firstLineMatch":     true,
-	"keyEquivalent":      true,
-	"foldingStopMarker":  true,
-	"foldingStartMarker": true,
-	"foldingEndMarker":   true,
-	"limitLineLength":    true,
-	"hideFromUser":       true,
-	"injectionSelector":  true,
+	"comment":               true,
+	"uuid":                  true,
+	"author":                true,
+	"comments":              true,
+	"macros":                true,
+	"fileTypes":             true,
+	"firstLineMatch":        true,
+	"keyEquivalent":         true,
+	"foldingStopMarker":     true,
+	"foldingStartMarker":    true,
+	"foldingEndMarker":      true,
+	"limitLineLength":       true,
+	"hideFromUser":          true,
+	"injectionSelector":     true,
+	"swallow":               true,
+	"foregroundColor":       true,
+	"backgroundColor":       true,
+	"increaseIndentPattern": true,
 }
