apply formatting after parse error

Author: Arthur Ozga

src/services/formatting/formatting.ts

@@ -363,7 +363,6 @@ namespace ts.formatting {
 
         // formatting context is used by rules provider
         const formattingContext = new FormattingContext(sourceFile, requestKind, options);
-        let previousRangeHasError: boolean;
         let previousRange: TextRangeWithKind;
         let previousParent: Node;
         let previousRangeStartLine: number;
@@ -848,7 +847,7 @@ namespace ts.formatting {
 
             const rangeHasError = rangeContainsError(range);
             let lineAdded: boolean;
-            if (!rangeHasError && !previousRangeHasError) {
+            if (!rangeHasError) {
                 if (!previousRange) {
                     // trim whitespaces starting from the beginning of the span up to the current line
                     const originalStart = sourceFile.getLineAndCharacterOfPosition(originalRange.pos);
@@ -863,7 +862,6 @@ namespace ts.formatting {
             previousRange = range;
             previousParent = parent;
             previousRangeStartLine = rangeStart.line;
-            previousRangeHasError = rangeHasError;
 
             return lineAdded;
         }

tests/cases/fourslash/formatOnEnterEmptyBlock.ts

@@ -0,0 +1,16 @@
+/// <reference path="fourslash.ts"/>
+
+//// if (true) {
+//// }
+//// if () {
+//// }
+
+format.setOption("PlaceOpenBraceOnNewLineForControlBlocks", true);
+format.document();
+verify.currentFileContentIs(
+`if (true)
+{
+}
+if ()
+{
+}`);

tests/cases/fourslash/fourslash.ts

@@ -329,7 +329,7 @@ declare namespace FourSlashInterface {
         setFormatOptions(options: FormatCodeOptions): any;
         selection(startMarker: string, endMarker: string): void;
         onType(posMarker: string, key: string): void;
-        setOption(name: string, value: number | string | boolean): void;
+        setOption(name: keyof FormatCodeOptions, value: number | string | boolean): void;
     }
     class cancellation {
         resetCancelled(): void;