Fix #91: Support open classes

Author: nicolasstucki

src/typescript/Scala.tmLanguage.ts

@@ -480,7 +480,7 @@ export const scalaTmLanguage: TmLanguage = {
           }
         },
         {
-          match: '\\b(?:(case)\\s+)?(class|object)\\s+([^\\s\\{\\(\\[]+)',
+          match: '\\b(?:(case|open)\\s+)?(class|object)\\s+([^\\s\\{\\(\\[]+)',
           captures: {
             '1': {
               name: 'keyword.declaration.scala'

tests/unit/#91.test.scala

@@ -0,0 +1,6 @@
+// SYNTAX TEST "source.scala"
+
+    open class A
+//  ^^^^ keyword.declaration.scala
+//       ^^^^^ keyword.declaration.scala
+//             ^ entity.name.class.declaration