Reorder show and setEditingState calls to the IMM (#43865)

packages/flutter/lib/src/widgets/editable_text.dart

@@ -1409,6 +1409,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
               keyboardAppearance: widget.keyboardAppearance,
           ),
       );
+      _textInputConnection.show();
 
       _updateSizeAndTransform();
       final TextStyle style = widget.style;
@@ -1421,8 +1422,9 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
           textAlign: widget.textAlign,
         )
         ..setEditingState(localValue);
+    } else {
+      _textInputConnection.show();
     }
-    _textInputConnection.show();
   }
 
   void _closeInputConnectionIfNeeded() {

packages/flutter/test/widgets/editable_text_test.dart

@@ -3413,6 +3413,45 @@ void main() {
       throwsAssertionError,
     );
   });
+
+  testWidgets('input imm channel calls are ordered correctly', (WidgetTester tester) async {
+    final List<MethodCall> log = <MethodCall>[];
+    SystemChannels.textInput.setMockMethodCallHandler((MethodCall methodCall) async {
+      log.add(methodCall);
+    });
+    const String testText = 'flutter is the best!';
+    final TextEditingController controller = TextEditingController(text: testText);
+    final EditableText et = EditableText(
+      showSelectionHandles: true,
+      maxLines: 2,
+      controller: controller,
+      focusNode: FocusNode(),
+      cursorColor: Colors.red,
+      backgroundCursorColor: Colors.blue,
+      style: Typography(platform: TargetPlatform.android).black.subhead.copyWith(fontFamily: 'Roboto'),
+      keyboardType: TextInputType.text,
+    );
+
+    await tester.pumpWidget(MaterialApp(
+      home: Align(
+        alignment: Alignment.topLeft,
+        child: SizedBox(
+          width: 100,
+          child: et,
+        ),
+      ),
+    ));
+
+    await tester.showKeyboard(find.byType(EditableText));
+    expect(log.length, 7);
+    // TextInput.show should be before TextInput.setEditingState
+    final List<String> logOrder = <String>['TextInput.setClient', 'TextInput.show', 'TextInput.setEditableSizeAndTransform', 'TextInput.setStyle', 'TextInput.setEditingState', 'TextInput.setEditingState', 'TextInput.show'];
+    int index = 0;
+    for (MethodCall m in log) {
+      expect(m.method, logOrder[index]);
+      index++;
+    }
+  });
 }
 
 class MockTextSelectionControls extends Mock implements TextSelectionControls {