some spaces formatting (#29452)

* some space formattings

* always use blocks in if-else if a block is used

* format spaces in for and while

* allow multiline if conditions

* fix missing space
diff --git a/packages/flutter_tools/lib/src/android/android_device.dart b/packages/flutter_tools/lib/src/android/android_device.dart
index b1bc093..a0ba839 100644
--- a/packages/flutter_tools/lib/src/android/android_device.dart
+++ b/packages/flutter_tools/lib/src/android/android_device.dart
@@ -792,7 +792,7 @@
       }
       _acceptedLastLine = false;
     } else if (line == '--------- beginning of system' ||
-               line == '--------- beginning of main' ) {
+               line == '--------- beginning of main') {
       // hide the ugly adb logcat log boundaries at the start
       _acceptedLastLine = false;
     } else {
diff --git a/packages/flutter_tools/lib/src/android/gradle.dart b/packages/flutter_tools/lib/src/android/gradle.dart
index 0fcbd77..e08a3c4 100644
--- a/packages/flutter_tools/lib/src/android/gradle.dart
+++ b/packages/flutter_tools/lib/src/android/gradle.dart
@@ -478,7 +478,7 @@
     throwToolExit('Gradle task $assembleTask failed with exit code $exitCode', exitCode: exitCode);
   }
 
-  if(!isBuildingBundle) {
+  if (!isBuildingBundle) {
     final File apkFile = _findApkFile(project, buildInfo);
     if (apkFile == null)
       throwToolExit('Gradle build failed to produce an Android package.');
diff --git a/packages/flutter_tools/lib/src/application_package.dart b/packages/flutter_tools/lib/src/application_package.dart
index 6d92f28..ff4b3c3 100644
--- a/packages/flutter_tools/lib/src/application_package.dart
+++ b/packages/flutter_tools/lib/src/application_package.dart
@@ -458,7 +458,7 @@
       final int level = line.length - trimLine.length;
 
       // Handle level out
-      while(level <= currentElement.level) {
+      while (level <= currentElement.level) {
         currentElement = currentElement.parent;
       }
 
diff --git a/packages/flutter_tools/lib/src/base/process.dart b/packages/flutter_tools/lib/src/base/process.dart
index c6ab59c..bd4015e 100644
--- a/packages/flutter_tools/lib/src/base/process.dart
+++ b/packages/flutter_tools/lib/src/base/process.dart
@@ -97,7 +97,7 @@
 Map<String, String> _environment(bool allowReentrantFlutter, [ Map<String, String> environment ]) {
   if (allowReentrantFlutter) {
     if (environment == null)
-      environment = <String, String>{ 'FLUTTER_ALREADY_LOCKED': 'true' };
+      environment = <String, String>{'FLUTTER_ALREADY_LOCKED': 'true'};
     else
       environment['FLUTTER_ALREADY_LOCKED'] = 'true';
   }
diff --git a/packages/flutter_tools/lib/src/commands/daemon.dart b/packages/flutter_tools/lib/src/commands/daemon.dart
index 2f93ae5..e7b650a 100644
--- a/packages/flutter_tools/lib/src/commands/daemon.dart
+++ b/packages/flutter_tools/lib/src/commands/daemon.dart
@@ -203,7 +203,7 @@
   }
 
   void sendEvent(String name, [ dynamic args ]) {
-    final Map<String, dynamic> map = <String, dynamic>{ 'event': name };
+    final Map<String, dynamic> map = <String, dynamic>{'event': name};
     if (args != null)
       map['params'] = _toJsonable(args);
     _send(map);
@@ -563,7 +563,7 @@
   }
 
   void _sendAppEvent(AppInstance app, String name, [ Map<String, dynamic> args ]) {
-    final Map<String, dynamic> eventArgs = <String, dynamic> { 'appId': app.id };
+    final Map<String, dynamic> eventArgs = <String, dynamic> {'appId': app.id};
     if (args != null)
       eventArgs.addAll(args);
     sendEvent('app.$name', eventArgs);
@@ -652,7 +652,7 @@
 
     hostPort = await device.portForwarder.forward(devicePort, hostPort: hostPort);
 
-    return <String, dynamic>{ 'hostPort': hostPort };
+    return <String, dynamic>{'hostPort': hostPort};
   }
 
   /// Removes a forwarded port.
diff --git a/packages/flutter_tools/lib/src/commands/drive.dart b/packages/flutter_tools/lib/src/commands/drive.dart
index 8b1c742..11df0d5 100644
--- a/packages/flutter_tools/lib/src/commands/drive.dart
+++ b/packages/flutter_tools/lib/src/commands/drive.dart
@@ -295,7 +295,7 @@
         '--packages=${PackageMap.globalPackagesPath}',
         '-rexpanded',
       ]),
-    environment: <String, String>{ 'VM_SERVICE_URL': observatoryUri },
+    environment: <String, String>{'VM_SERVICE_URL': observatoryUri},
   );
   if (result != 0)
     throwToolExit('Driver tests failed: $result', exitCode: result);
diff --git a/packages/flutter_tools/lib/src/commands/version.dart b/packages/flutter_tools/lib/src/commands/version.dart
index 22564de..33884d2 100644
--- a/packages/flutter_tools/lib/src/commands/version.dart
+++ b/packages/flutter_tools/lib/src/commands/version.dart
@@ -16,7 +16,7 @@
 import '../version.dart';
 
 class VersionCommand extends FlutterCommand {
-  VersionCommand(): super() {
+  VersionCommand() : super() {
     argParser.addFlag('force',
       abbr: 'f',
       help: 'Force switch to older Flutter versions that do not include a version command',
diff --git a/packages/flutter_tools/lib/src/compile.dart b/packages/flutter_tools/lib/src/compile.dart
index b7945fd..4e8a69c 100644
--- a/packages/flutter_tools/lib/src/compile.dart
+++ b/packages/flutter_tools/lib/src/compile.dart
@@ -378,7 +378,7 @@
 }
 
 class _RejectRequest extends _CompilationRequest {
-  _RejectRequest(Completer<CompilerOutput> completer): super(completer);
+  _RejectRequest(Completer<CompilerOutput> completer) : super(completer);
 
   @override
   Future<CompilerOutput> _run(ResidentCompiler compiler) async =>
diff --git a/packages/flutter_tools/lib/src/doctor.dart b/packages/flutter_tools/lib/src/doctor.dart
index be0d09e..962bba6 100644
--- a/packages/flutter_tools/lib/src/doctor.dart
+++ b/packages/flutter_tools/lib/src/doctor.dart
@@ -501,8 +501,8 @@
   String get pluginsPath;
 
   static final Map<String, String> _idToTitle = <String, String>{
-    'IntelliJIdea' : 'IntelliJ IDEA Ultimate Edition',
-    'IdeaIC' : 'IntelliJ IDEA Community Edition',
+    'IntelliJIdea': 'IntelliJ IDEA Ultimate Edition',
+    'IdeaIC': 'IntelliJ IDEA Community Edition',
   };
 
   static final Version kMinIdeaVersion = Version(2017, 1, 0);
@@ -615,9 +615,9 @@
   final String id;
 
   static final Map<String, String> _dirNameToId = <String, String>{
-    'IntelliJ IDEA.app' : 'IntelliJIdea',
-    'IntelliJ IDEA Ultimate.app' : 'IntelliJIdea',
-    'IntelliJ IDEA CE.app' : 'IdeaIC',
+    'IntelliJ IDEA.app': 'IntelliJIdea',
+    'IntelliJ IDEA Ultimate.app': 'IntelliJIdea',
+    'IntelliJ IDEA CE.app': 'IdeaIC',
   };
 
   static Iterable<DoctorValidator> get installed {
diff --git a/packages/flutter_tools/lib/src/flutter_manifest.dart b/packages/flutter_tools/lib/src/flutter_manifest.dart
index 7b39071..4a04029 100644
--- a/packages/flutter_tools/lib/src/flutter_manifest.dart
+++ b/packages/flutter_tools/lib/src/flutter_manifest.dart
@@ -102,9 +102,8 @@
   String get buildName {
     if (appVersion != null && appVersion.contains('+'))
       return appVersion.split('+')?.elementAt(0);
-    else {
+    else
       return appVersion;
-    }
   }
 
   /// The build version number from the `pubspec.yaml` file.
diff --git a/packages/flutter_tools/lib/src/ios/code_signing.dart b/packages/flutter_tools/lib/src/ios/code_signing.dart
index 183c90e..3820e87 100644
--- a/packages/flutter_tools/lib/src/ios/code_signing.dart
+++ b/packages/flutter_tools/lib/src/ios/code_signing.dart
@@ -187,8 +187,7 @@
       if (validCodeSigningIdentities.contains(savedCertChoice)) {
         printStatus('Found saved certificate choice "$savedCertChoice". To clear, use "flutter config".');
         return savedCertChoice;
-      }
-      else {
+      } else {
         printError('Saved signing certificate "$savedCertChoice" is not a valid development certificate');
       }
     }
diff --git a/packages/flutter_tools/lib/src/ios/devices.dart b/packages/flutter_tools/lib/src/ios/devices.dart
index 4c6278e..2959a2e 100644
--- a/packages/flutter_tools/lib/src/ios/devices.dart
+++ b/packages/flutter_tools/lib/src/ios/devices.dart
@@ -433,7 +433,7 @@
   try {
     final List<int> bytes = utf8.encode(line);
     final List<int> out = <int>[];
-    for (int i = 0; i < bytes.length; ) {
+    for (int i = 0; i < bytes.length;) {
       if (bytes[i] != kBackslash || i > bytes.length - 4) {
         // Unmapped byte: copy as-is.
         out.add(bytes[i++]);
diff --git a/packages/flutter_tools/lib/src/ios/ios_workflow.dart b/packages/flutter_tools/lib/src/ios/ios_workflow.dart
index 4ae1173..675df08 100644
--- a/packages/flutter_tools/lib/src/ios/ios_workflow.dart
+++ b/packages/flutter_tools/lib/src/ios/ios_workflow.dart
@@ -192,8 +192,7 @@
           status = ValidationType.missing;
           messages.add(ValidationMessage.error(
               userMessages.cocoaPodsMissing(noCocoaPodsConsequence, cocoaPodsInstallInstructions)));
-        }
-        else if (cocoaPodsStatus == CocoaPodsStatus.unknownVersion) {
+        } else if (cocoaPodsStatus == CocoaPodsStatus.unknownVersion) {
           status = ValidationType.partial;
           messages.add(ValidationMessage.hint(
               userMessages.cocoaPodsUnknownVersion(unknownCocoaPodsConsequence, cocoaPodsUpgradeInstructions)));
diff --git a/packages/flutter_tools/lib/src/ios/mac.dart b/packages/flutter_tools/lib/src/ios/mac.dart
index e754274..50bdf32 100644
--- a/packages/flutter_tools/lib/src/ios/mac.dart
+++ b/packages/flutter_tools/lib/src/ios/mac.dart
@@ -599,8 +599,7 @@
   if (result.xcodeBuildExecution != null &&
       result.xcodeBuildExecution.buildForPhysicalDevice &&
       !<String>['DEVELOPMENT_TEAM', 'PROVISIONING_PROFILE'].any(
-        result.xcodeBuildExecution.buildSettings.containsKey)
-      ) {
+        result.xcodeBuildExecution.buildSettings.containsKey)) {
     printError(noDevelopmentTeamInstruction, emphasis: true);
     return;
   }
@@ -722,7 +721,7 @@
     // the directory and basenames.
     'framework': fs.path.basenameWithoutExtension(service['ios-framework']),
   }).toList();
-  final Map<String, dynamic> jsonObject = <String, dynamic>{ 'services' : jsonServices };
+  final Map<String, dynamic> jsonObject = <String, dynamic>{'services': jsonServices};
   manifest.writeAsStringSync(json.encode(jsonObject), mode: FileMode.write, flush: true);
 }
 
diff --git a/packages/flutter_tools/lib/src/ios/plist_utils.dart b/packages/flutter_tools/lib/src/ios/plist_utils.dart
index 2b3b75c..0a67279 100644
--- a/packages/flutter_tools/lib/src/ios/plist_utils.dart
+++ b/packages/flutter_tools/lib/src/ios/plist_utils.dart
@@ -29,7 +29,7 @@
     final List<String> args = <String>[
       executable, 'read', normalizedPlistPath,
     ];
-    if (key != null && key.isNotEmpty){
+    if (key != null && key.isNotEmpty) {
       args.add(key);
     }
     final String value = runCheckedSync(args);
diff --git a/packages/flutter_tools/lib/src/run_hot.dart b/packages/flutter_tools/lib/src/run_hot.dart
index 524f9ff..31de4bd 100644
--- a/packages/flutter_tools/lib/src/run_hot.dart
+++ b/packages/flutter_tools/lib/src/run_hot.dart
@@ -406,7 +406,7 @@
     final Map<String, String> analyticsParameters =
       reason == null
         ? null
-        : <String, String>{ kEventReloadReasonParameterName: reason };
+        : <String, String>{kEventReloadReasonParameterName: reason};
 
     if (!_isPaused()) {
       printTrace('Refreshing active FlutterViews before restarting.');
diff --git a/packages/flutter_tools/lib/src/services.dart b/packages/flutter_tools/lib/src/services.dart
index 1a71757..7cd0a58 100644
--- a/packages/flutter_tools/lib/src/services.dart
+++ b/packages/flutter_tools/lib/src/services.dart
@@ -105,7 +105,7 @@
         'class': service['android-class'],
       }).toList();
 
-  final Map<String, dynamic> jsonObject = <String, dynamic>{ 'services': services };
+  final Map<String, dynamic> jsonObject = <String, dynamic>{'services': services};
   final File servicesFile = fs.file(fs.path.join(dir, 'services.json'));
   servicesFile.writeAsStringSync(json.encode(jsonObject), mode: FileMode.write, flush: true);
   return servicesFile;
diff --git a/packages/flutter_tools/lib/src/test/event_printer.dart b/packages/flutter_tools/lib/src/test/event_printer.dart
index 81fd5798..dee2d00 100644
--- a/packages/flutter_tools/lib/src/test/event_printer.dart
+++ b/packages/flutter_tools/lib/src/test/event_printer.dart
@@ -19,7 +19,7 @@
   }
 
   void _sendEvent(String name, [ dynamic params ]) {
-    final Map<String, dynamic> map = <String, dynamic>{ 'event': name};
+    final Map<String, dynamic> map = <String, dynamic>{'event': name};
     if (params != null) {
       map['params'] = params;
     }
diff --git a/packages/flutter_tools/lib/src/vmservice.dart b/packages/flutter_tools/lib/src/vmservice.dart
index e2c2890..545e773 100644
--- a/packages/flutter_tools/lib/src/vmservice.dart
+++ b/packages/flutter_tools/lib/src/vmservice.dart
@@ -352,7 +352,7 @@
   Future<void> _streamListen(String streamId) async {
     if (!_listeningFor.contains(streamId)) {
       _listeningFor.add(streamId);
-      await _sendRequest('streamListen', <String, dynamic>{ 'streamId': streamId });
+      await _sendRequest('streamListen', <String, dynamic>{'streamId': streamId});
     }
   }
 
@@ -873,7 +873,7 @@
 
   /// Create a new development file system on the device.
   Future<Map<String, dynamic>> createDevFS(String fsName) {
-    return invokeRpcRaw('_createDevFS', params: <String, dynamic> { 'fsName': fsName });
+    return invokeRpcRaw('_createDevFS', params: <String, dynamic> {'fsName': fsName});
   }
 
   /// List the development file system son the device.
@@ -913,12 +913,12 @@
 
   /// The complete list of a file system.
   Future<List<String>> listDevFSFiles(String fsName) async {
-    return (await invokeRpcRaw('_listDevFSFiles', params: <String, dynamic>{ 'fsName': fsName }))['files'];
+    return (await invokeRpcRaw('_listDevFSFiles', params: <String, dynamic>{'fsName': fsName}))['files'];
   }
 
   /// Delete an existing file system.
   Future<Map<String, dynamic>> deleteDevFS(String fsName) {
-    return invokeRpcRaw('_deleteDevFS', params: <String, dynamic>{ 'fsName': fsName });
+    return invokeRpcRaw('_deleteDevFS', params: <String, dynamic>{'fsName': fsName});
   }
 
   Future<ServiceMap> runInView(
@@ -1273,7 +1273,7 @@
     if (state != null && state.containsKey('enabled') && state['enabled'] is String) {
       state = await invokeFlutterExtensionRpcRaw(
         'ext.flutter.$name',
-        params: <String, dynamic>{ 'enabled': state['enabled'] == 'true' ? 'false' : 'true' },
+        params: <String, dynamic>{'enabled': state['enabled'] == 'true' ? 'false' : 'true'},
       );
     }
     return state;
@@ -1288,7 +1288,7 @@
   Future<Map<String, dynamic>> flutterDebugAllowBanner(bool show) {
     return invokeFlutterExtensionRpcRaw(
       'ext.flutter.debugAllowBanner',
-      params: <String, dynamic>{ 'enabled': show ? 'true' : 'false' },
+      params: <String, dynamic>{'enabled': show ? 'true' : 'false'},
     );
   }
 
@@ -1331,7 +1331,7 @@
   Future<String> flutterPlatformOverride([ String platform ]) async {
     final Map<String, dynamic> result = await invokeFlutterExtensionRpcRaw(
       'ext.flutter.platformOverride',
-      params: platform != null ? <String, dynamic>{ 'value': platform } : <String, String>{},
+      params: platform != null ? <String, dynamic>{'value': platform} : <String, String>{},
     );
     if (result != null && result['value'] is String)
       return result['value'];