Disable incremental by default before merging into master.

src/harness/fourslash.ts

@@ -18,6 +18,8 @@
 /// <reference path='harness.ts' />
 
 module FourSlash {
+    ts.disableIncrementalParsing = false;
+
     // Represents a parsed source file with metadata
     export interface FourSlashFile {
         // The contents of the file (with markers, etc stripped out)

src/services/services.ts

@@ -1553,7 +1553,7 @@ module ts {
         return sourceFile;
     }
 
-    export var disableIncrementalParsing = false;
+    export var disableIncrementalParsing = true;
 
     export function updateLanguageServiceSourceFile(sourceFile: SourceFile, scriptSnapshot: IScriptSnapshot, version: string, isOpen: boolean, textChangeRange: TextChangeRange): SourceFile {
         if (textChangeRange && Debug.shouldAssert(AssertionLevel.Normal)) {

tests/cases/unittests/incrementalParser.ts

@@ -2,6 +2,8 @@
 /// <reference path="..\..\..\src\compiler\parser.ts" />
 
 module ts {
+    ts.disableIncrementalParsing = false;
+
     function withChange(text: IScriptSnapshot, start: number, length: number, newText: string): { text: IScriptSnapshot; textChangeRange: TextChangeRange; } {
         var contents = text.getText(0, text.getLength());
         var newContents = contents.substr(0, start) + newText + contents.substring(start + length);