Test transitive references in folders side by side so that later we can add tsserver tests as well

Author: sheetalkamat

src/compiler/watch.ts

@@ -780,7 +780,7 @@ namespace ts {
                         (hostSourceFileInfo as FilePresentOnHost).fileWatcher.close();
                     }
                     sourceFilesCache.delete(oldSourceFile.resolvedPath);
-                    if (oldSourceFile.resolvedPath === oldSourceFile.path || !hasSourceFileByPath) {
+                    if (!hasSourceFileByPath) {
                         resolutionCache.removeResolutionsOfFile(oldSourceFile.path);
                     }
                 }

src/server/project.ts

@@ -925,8 +925,8 @@ namespace ts.server {
                         const newFile = this.program.getSourceFileByPath(f.resolvedPath);
                         if (!newFile || (f.resolvedPath === f.path && newFile.resolvedPath !== f.path)) {
                             // new program does not contain this file - detach it from the project
-                            // - remove resolutions only if this is undirected file or doesnt have source file with the path in new program
-                            this.detachScriptInfoFromProject(f.fileName, f.path !== f.resolvedPath && !!this.program.getSourceFileByPath(f.path));
+                            // - remove resolutions only if the new program doesnt contain source file by the path (not resolvedPath since path is used for resolution)
+                            this.detachScriptInfoFromProject(f.fileName, !!this.program.getSourceFileByPath(f.path));
                         }
                     }