request.mainUri should be fileUri (#68329)

packages/flutter_tools/lib/src/compile.dart

@@ -600,7 +600,7 @@ class DefaultResidentCompiler implements ResidentCompiler {
         message = fileUri.toString();
       } else {
         message = request.packageConfig.toPackageUri(fileUri)?.toString() ??
-          toMultiRootPath(request.mainUri, fileSystemScheme, fileSystemRoots, _platform.isWindows);
+          toMultiRootPath(fileUri, fileSystemScheme, fileSystemRoots, _platform.isWindows);
       }
       _server.stdin.writeln(message);
       _logger.printTrace(message.toString());

packages/flutter_tools/test/general.shard/compile_incremental_test.dart

@@ -199,14 +199,70 @@ void main() {
     await _recompile(streamController, generatorWithScheme, mockFrontendServerStdIn,
       'result abc\nline1\nline2\nabc\nabc /path/to/main.dart.dill 0\n',
       mainUri: Uri.parse('file:///foo/bar/fizz/main.dart'),
-      expectedUri: 'scheme:///main.dart');
+      expectedMainUri: 'scheme:///main.dart');
 
     await _accept(streamController, generatorWithScheme, mockFrontendServerStdIn, r'^accept\n$');
 
     await _recompile(streamController, generatorWithScheme, mockFrontendServerStdIn,
       'result abc\nline1\nline2\nabc\nabc /path/to/main.dart.dill 0\n',
       mainUri: Uri.parse('file:///foo/bar/fizz/main.dart'),
-      expectedUri: 'scheme:///main.dart');
+      expectedMainUri: 'scheme:///main.dart');
+    // No sources returned from reject command.
+    await _reject(streamController, generatorWithScheme, mockFrontendServerStdIn, 'result abc\nabc\n',
+      r'^reject\n$');
+    verifyNoMoreInteractions(mockFrontendServerStdIn);
+    expect(mockFrontendServerStdIn.getAndClear(), isEmpty);
+    expect(testLogger.errorText, equals(
+      'line0\nline1\n'
+      'line1\nline2\n'
+      'line1\nline2\n'
+    ));
+  });
+
+  testWithoutContext('incremental compile and recompile non-entrypoint file with filesystem scheme', () async {
+    final Uri mainUri = Uri.parse('file:///foo/bar/fizz/main.dart');
+    const String expectedMainUri = 'scheme:///main.dart';
+    final List<Uri> updatedUris = <Uri>[
+      mainUri,
+      Uri.parse('file:///foo/bar/fizz/other.dart'),
+    ];
+    const List<String> expectedUpdatedUris = <String>[
+      expectedMainUri,
+      'scheme:///other.dart',
+    ];
+
+    final StreamController<List<int>> streamController = StreamController<List<int>>();
+    when(mockFrontendServer.stdout)
+        .thenAnswer((Invocation invocation) => streamController.stream);
+    streamController.add(utf8.encode('result abc\nline0\nline1\nabc\nabc /path/to/main.dart.dill 0\n'));
+    await generatorWithScheme.recompile(
+      Uri.parse('file:///foo/bar/fizz/main.dart'),
+      null, /* invalidatedFiles */
+      outputPath: '/build/',
+      packageConfig: PackageConfig.empty,
+    );
+    expect(mockFrontendServerStdIn.getAndClear(), 'compile scheme:///main.dart\n');
+
+    // No accept or reject commands should be issued until we
+    // send recompile request.
+    await _accept(streamController, generatorWithScheme, mockFrontendServerStdIn, '');
+    await _reject(streamController, generatorWithScheme, mockFrontendServerStdIn, '', '');
+
+    await _recompile(streamController, generatorWithScheme, mockFrontendServerStdIn,
+      'result abc\nline1\nline2\nabc\nabc /path/to/main.dart.dill 0\n',
+      mainUri: mainUri,
+      expectedMainUri: expectedMainUri,
+      updatedUris: updatedUris,
+      expectedUpdatedUris: expectedUpdatedUris);
+
+    await _accept(streamController, generatorWithScheme, mockFrontendServerStdIn, r'^accept\n$');
+
+    await _recompile(streamController, generatorWithScheme, mockFrontendServerStdIn,
+      'result abc\nline1\nline2\nabc\nabc /path/to/main.dart.dill 0\n',
+      mainUri: mainUri,
+      expectedMainUri: expectedMainUri,
+      updatedUris: updatedUris,
+      expectedUpdatedUris: expectedUpdatedUris);
     // No sources returned from reject command.
     await _reject(streamController, generatorWithScheme, mockFrontendServerStdIn, 'result abc\nabc\n',
       r'^reject\n$');
@@ -291,9 +347,13 @@ Future<void> _recompile(
   String mockCompilerOutput, {
   bool suppressErrors = false,
   Uri mainUri,
-  String expectedUri = '/path/to/main.dart',
+  String expectedMainUri = '/path/to/main.dart',
+  List<Uri> updatedUris,
+  List<String> expectedUpdatedUris,
 }) async {
   mainUri ??= Uri.parse('/path/to/main.dart');
+  updatedUris ??= <Uri>[mainUri];
+  expectedUpdatedUris ??= <String>[expectedMainUri];
 
   // Put content into the output stream after generator.recompile gets
   // going few lines below, resets completer.
@@ -302,7 +362,7 @@ Future<void> _recompile(
   });
   final CompilerOutput output = await generator.recompile(
     mainUri,
-    <Uri>[mainUri],
+    updatedUris,
     outputPath: '/build/',
     packageConfig: PackageConfig.empty,
     suppressErrors: suppressErrors,
@@ -313,8 +373,11 @@ Future<void> _recompile(
   final List<String> parts = commands.split(whitespace);
 
   // Test that uuid matches at beginning and end.
-  expect(parts[2], equals(parts[4]));
-  expect(parts[1], equals(expectedUri));
+  expect(parts[2], equals(parts[3 + updatedUris.length]));
+  expect(parts[1], equals(expectedMainUri));
+  for (int i = 0; i < expectedUpdatedUris.length; i++) {
+    expect(parts[3 + i], equals(expectedUpdatedUris[i]));
+  }
   mockFrontendServerStdIn.stdInWrites.clear();
 }