[Master] Fix 15179 missing comment in switch case clause (#16033)

* Fix emit comments after switch case clause

* Update baselines

* Add new tests and baselines

src/compiler/emitter.ts

@@ -2021,6 +2021,22 @@ namespace ts {
                     rangeStartPositionsAreOnSameLine(parentNode, statements[0], currentSourceFile)
                 );
 
+            // e.g:
+            //      case 0: // Zero
+            //      case 1: // One
+            //      case 2: // two
+            //          return "hi";
+            // If there is no statements, emitNodeWithComments of the parentNode which is caseClause will take care of trailing comment.
+            // So in example above, comment "// Zero" and "// One" will be emit in emitTrailingComments in emitNodeWithComments.
+            // However, for "case 2", because parentNode which is caseClause has an "end" property to be end of the statements (in this case return statement)
+            // comment "// two" will not be emitted in emitNodeWithComments.
+            // Therefore, we have to do the check here to emit such comment.
+            if (statements.length > 0) {
+                // We use emitTrailingCommentsOfPosition instead of emitLeadingCommentsOfPosition because leading comments is defined as comments before the node after newline character separating it from previous line
+                // Note: we can't use parentNode.end as such position includes statements.
+                emitTrailingCommentsOfPosition(statements.pos);
+            }
+
             if (emitAsSingleStatement) {
                 write(" ");
                 emit(statements[0]);