Cherry-pick PR microsoft#49246 into release-4.7 (microsoft#49250)

Component commits:
b846905 Add failing test

66d51e5 Fix the implicit glob key so that recursive keys are not differing just by directory seperator Fixes microsoft#49078

f93951f Reset the reload level once program is loaded

Co-authored-by: Sheetal Nandi <[email protected]>

src/compiler/commandLineParser.ts

@@ -3542,7 +3542,7 @@ namespace ts {
         }
         if (isImplicitGlob(spec.substring(spec.lastIndexOf(directorySeparator) + 1))) {
             return {
-                key: useCaseSensitiveFileNames ? spec : toFileNameLowerCase(spec),
+                key: removeTrailingDirectorySeparator(useCaseSensitiveFileNames ? spec : toFileNameLowerCase(spec)),
                 flags: WatchDirectoryFlags.Recursive
             };
         }

src/compiler/watchPublic.ts

@@ -700,6 +700,7 @@ namespace ts {
 
         function reloadFileNamesFromConfigFile() {
             writeLog("Reloading new file names and options");
+            reloadLevel = ConfigFileProgramReloadLevel.None;
             rootFileNames = getFileNamesFromConfigSpecs(compilerOptions.configFile!.configFileSpecs!, getNormalizedAbsolutePath(getDirectoryPath(configFileName), currentDirectory), compilerOptions, parseConfigFileHost, extraFileExtensions);
             if (updateErrorForNoInputFiles(rootFileNames, getNormalizedAbsolutePath(configFileName, currentDirectory), compilerOptions.configFile!.configFileSpecs!, configFileParsingDiagnostics!, canConfigFileJsonReportNoInputFiles)) {
                 hasChangedConfigFileParsingErrors = true;

src/testRunner/unittests/config/tsconfigParsing.ts

@@ -421,5 +421,14 @@ namespace ts {
             const parsedCommand = parseJsonConfigFileContent(parsed.config, sys, "/foo.bar");
             assert.deepEqual(parsedCommand.wildcardDirectories, { "/foo.bar/src": WatchDirectoryFlags.Recursive });
         });
+
+        it("correctly parses wild card directories from implicit glob when two keys differ only in directory seperator", () => {
+            const parsed = parseConfigFileTextToJson("/foo.bar/tsconfig.json", JSON.stringify({
+                include: ["./", "./**/*.json"]
+            }));
+
+            const parsedCommand = parseJsonConfigFileContent(parsed.config, sys, "/foo");
+            assert.deepEqual(parsedCommand.wildcardDirectories, { "/foo": WatchDirectoryFlags.Recursive });
+        });
     });
 }

src/testRunner/unittests/tscWatch/programUpdates.ts

@@ -616,6 +616,39 @@ export class A {
             ]
         });
 
+        verifyTscWatch({
+            scenario,
+            subScenario: "correctly parses wild card directories from implicit glob when two keys differ only in directory seperator",
+            commandLineArgs: ["-w", "--extendedDiagnostics"],
+            sys: () => {
+                const file1 = {
+                    path: `${projectRoot}/f1.ts`,
+                    content: "export const x = 1"
+                };
+                const file2 = {
+                    path: `${projectRoot}/f2.ts`,
+                    content: "export const y = 1"
+                };
+                const configFile = {
+                    path: `${projectRoot}/tsconfig.json`,
+                    content: JSON.stringify({ compilerOptions: { composite: true }, include: ["./", "./**/*.json"] })
+                };
+                return createWatchedSystem([file1, file2, libFile, configFile], { currentDirectory: projectRoot });
+            },
+            changes: [
+                {
+                    caption: "Add new file",
+                    change: sys => sys.writeFile(`${projectRoot}/new-file.ts`, "export const z = 1;"),
+                    timeouts: sys => sys.checkTimeoutQueueLengthAndRun(1),
+                },
+                {
+                    caption: "Import new file",
+                    change: sys => sys.prependFile(`${projectRoot}/f1.ts`, `import { z } from "./new-file";`),
+                    timeouts: sys => sys.checkTimeoutQueueLengthAndRun(1),
+                }
+            ]
+        });
+
         verifyTscWatch({
             scenario,
             subScenario: "can correctly update configured project when set of root files has changed through include",