Retain old behavior in compile on save by disabling use of file version as signature in when state is not reused

Author: sheetalkamat

src/server/project.ts

@@ -640,7 +640,7 @@ namespace ts.server {
                 return [];
             }
             updateProjectIfDirty(this);
-            this.builderState = BuilderState.create(this.program!, this.projectService.toCanonicalFileName, this.builderState);
+            this.builderState = BuilderState.create(this.program!, this.projectService.toCanonicalFileName, this.builderState, /*disableUseFileVersionAsSignature*/ true);
             return mapDefined(
                 BuilderState.getFilesAffectedBy(
                     this.builderState,

src/testRunner/unittests/tsserver/compileOnSave.ts

@@ -951,14 +951,10 @@ function bar() {
                 }
 
                 // Change file1 get affected file list
-                verifyLocalEdit(file1, "hello", "world", /*returnsAllFilesAsAffected*/ !declaration); // Signatures are not initialized before this request
-                verifyLocalEdit(file1, "world", "hello");
                 verifyLocalEdit(file1, "hello", "world");
 
                 // Change file2 get affected file list = will return only file2 if --declaration otherwise all files
                 verifyLocalEdit(file2, "world", "hello", /*returnsAllFilesAsAffected*/ !declaration);
-                verifyLocalEdit(file2, "hello", "world");
-                verifyLocalEdit(file2, "world", "hello");
 
                 function verifyFileSave(file: File) {
                     const response = session.executeCommandSeq<protocol.CompileOnSaveEmitFileRequest>({