Add outlining spans for case clauses

src/services/outliningElementsCollector.ts

@@ -200,6 +200,9 @@ namespace ts.OutliningElementsCollector {
             case SyntaxKind.EnumDeclaration:
             case SyntaxKind.CaseBlock:
                 return spanForNode(n);
+            case SyntaxKind.CaseClause:
+            case SyntaxKind.DefaultClause:
+                return spanForNodeArray((n as CaseClause | DefaultClause).statements);
             case SyntaxKind.ObjectLiteralExpression:
                 return spanForObjectOrArrayLiteral(n);
             case SyntaxKind.ArrayLiteralExpression:
@@ -256,6 +259,10 @@ namespace ts.OutliningElementsCollector {
             const closeToken = findChildOfKind(n, close, sourceFile);
             return openToken && closeToken && spanBetweenTokens(openToken, closeToken, hintSpanNode, sourceFile, autoCollapse, useFullStart);
         }
+
+        function spanForNodeArray(nodeArray: NodeArray<Node>): OutliningSpan | undefined {
+            return nodeArray.length ? createOutliningSpan(createTextSpanFromRange(nodeArray), OutliningSpanKind.Code) : undefined;
+        }
     }
 
     function functionSpan(node: FunctionLike, body: Block, sourceFile: SourceFile): OutliningSpan | undefined {

tests/cases/fourslash/outliningSpansSwitchCases.ts

@@ -0,0 +1,37 @@
+/// <reference path="fourslash.ts" />
+
+////switch (undefined)[| {
+//// case 0:[|
+////   console.log(1)
+////   console.log(2)
+////   break;
+////   console.log(3);|]
+//// case 1:[|
+////   break;|]
+//// case 2:[|
+////   break;
+////   console.log(3);|]
+//// case 3:[|
+////   console.log(4);|]
+//// 
+//// case 4:
+//// case 5:
+//// case 6:[|
+////
+////
+////   console.log(5);|]
+//// 
+//// case 7:[| console.log(6);|]
+////
+//// case 8:[| [|{
+////   console.log(8);
+////   break;
+//// }|]
+//// console.log(8);|]
+////
+//// default:[|
+////   console.log(7);
+////   console.log(8);|]
+////}|]
+
+verify.outliningSpansInCurrentFile(test.ranges(), "code");