Handle getScriptVersion correctly to ensure program structure is checked correctly (#36808)

* Fix tests when there are project references but has disableSourceOfProjectReferenceRedirect

* Handle getScriptVersion correctly to ensure program structure is checked correctly
Fixes #36748

* Harness's language service host doesnt have getProjectVersion.
This means earlier we were creating fresh program everytime we did LS operation
Now we reuse same program, so quick info depends on order of quickinfo demands

* Because same program is used, it unvails a bug that if `export=` is evaluated before finding references, it cant find all definitions from the merge

* Update src/server/project.ts

Co-Authored-By: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>

* Make clearSourceMapperCache required

Co-authored-by: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>

src/server/editorServices.ts

@@ -873,9 +873,11 @@ namespace ts.server {
             this.delayEnsureProjectForOpenFiles();
         }
 
-        private delayUpdateProjectGraphs(projects: readonly Project[]) {
+        private delayUpdateProjectGraphs(projects: readonly Project[], clearSourceMapperCache: boolean) {
             if (projects.length) {
                 for (const project of projects) {
+                    // Even if program doesnt change, clear the source mapper cache
+                    if (clearSourceMapperCache) project.clearSourceMapperCache();
                     this.delayUpdateProjectGraph(project);
                 }
                 this.delayEnsureProjectForOpenFiles();
@@ -1033,7 +1035,7 @@ namespace ts.server {
                     // file has been changed which might affect the set of referenced files in projects that include
                     // this file and set of inferred projects
                     info.delayReloadNonMixedContentFile();
-                    this.delayUpdateProjectGraphs(info.containingProjects);
+                    this.delayUpdateProjectGraphs(info.containingProjects, /*clearSourceMapperCache*/ false);
                     this.handleSourceMapProjects(info);
                 }
             }
@@ -1066,7 +1068,7 @@ namespace ts.server {
         private delayUpdateProjectsOfScriptInfoPath(path: Path) {
             const info = this.getScriptInfoForPath(path);
             if (info) {
-                this.delayUpdateProjectGraphs(info.containingProjects);
+                this.delayUpdateProjectGraphs(info.containingProjects, /*clearSourceMapperCache*/ true);
             }
         }
 
@@ -1082,7 +1084,7 @@ namespace ts.server {
                 info.detachAllProjects();
 
                 // update projects to make sure that set of referenced files is correct
-                this.delayUpdateProjectGraphs(containingProjects);
+                this.delayUpdateProjectGraphs(containingProjects, /*clearSourceMapperCache*/ false);
                 this.handleSourceMapProjects(info);
                 info.closeSourceMapFileWatcher();
                 // need to recalculate source map from declaration file
@@ -2537,7 +2539,7 @@ namespace ts.server {
                     const declarationInfo = this.getScriptInfoForPath(declarationInfoPath);
                     if (declarationInfo && declarationInfo.sourceMapFilePath && !isString(declarationInfo.sourceMapFilePath)) {
                         // Update declaration and source projects
-                        this.delayUpdateProjectGraphs(declarationInfo.containingProjects);
+                        this.delayUpdateProjectGraphs(declarationInfo.containingProjects, /*clearSourceMapperCache*/ true);
                         this.delayUpdateSourceInfoProjects(declarationInfo.sourceMapFilePath.sourceInfos);
                         declarationInfo.closeSourceMapFileWatcher();
                     }

src/server/project.ts

@@ -384,7 +384,9 @@ namespace ts.server {
         }
 
         getScriptVersion(filename: string) {
-            const info = this.getOrCreateScriptInfoAndAttachToProject(filename);
+            // Don't attach to the project if version is asked
+
+            const info = this.projectService.getOrCreateScriptInfoNotOpenedByClient(filename, this.currentDirectory, this.directoryStructureHost);
             return (info && info.getLatestVersion())!; // TODO: GH#18217
         }
 
@@ -558,6 +560,11 @@ namespace ts.server {
             return this.getLanguageService().getSourceMapper();
         }
 
+        /** @internal */
+        clearSourceMapperCache() {
+            this.languageService.clearSourceMapperCache();
+        }
+
         /*@internal*/
         getDocumentPositionMapper(generatedFileName: string, sourceFileName?: string): DocumentPositionMapper | undefined {
             return this.projectService.getDocumentPositionMapper(this, generatedFileName, sourceFileName);
@@ -1224,7 +1231,10 @@ namespace ts.server {
                 watcher: this.projectService.watchFactory.watchFile(
                     this.projectService.host,
                     generatedFile,
-                    () => this.projectService.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(this),
+                    () => {
+                        this.clearSourceMapperCache();
+                        this.projectService.delayUpdateProjectGraphAndEnsureProjectStructureForOpenFiles(this);
+                    },
                     PollingInterval.High,
                     this.projectService.getWatchOptions(this),
                     WatchType.MissingGeneratedFile,

src/server/scriptInfo.ts

@@ -557,6 +557,8 @@ namespace ts.server {
         }
 
         getLatestVersion() {
+            // Ensure we have updated snapshot to give back latest version
+            this.textStorage.getSnapshot();
             return this.textStorage.getVersion();
         }