Pull up `TextEditingDeltaHistoryManager` to drop redundancy (#1306)

simplistic_editor/lib/main.dart

@@ -303,6 +303,9 @@ class _MyHomePageState extends State<MyHomePage> {
                 _updateToggleButtonsStateOnButtonPressed,
             updateToggleButtonStateOnSelectionChanged:
                 _updateToggleButtonsStateOnSelectionChanged,
+            child: TextEditingDeltaHistoryManager(
+              history: _textEditingDeltaHistory,
+              updateHistoryOnInput: _updateTextEditingDeltaHistory,
               child: Column(
                 children: [
                   Padding(
@@ -325,8 +328,8 @@ class _MyHomePageState extends State<MyHomePage> {
                               manager.toggleButtonsState
                                   .contains(ToggleButtonsState.underline),
                             ],
-                          onPressed: (index) =>
+                            onPressed: (index) => manager
-                              manager.updateToggleButtonsOnButtonPressed(index),
+                                .updateToggleButtonsOnButtonPressed(index),
                             children: const [
                               Icon(Icons.format_bold),
                               Icon(Icons.format_italic),
@@ -340,9 +343,6 @@ class _MyHomePageState extends State<MyHomePage> {
                   Expanded(
                     child: Padding(
                       padding: const EdgeInsets.symmetric(horizontal: 35.0),
-                    child: TextEditingDeltaHistoryManager(
-                      history: _textEditingDeltaHistory,
-                      updateHistoryOnInput: _updateTextEditingDeltaHistory,
                       child: BasicTextField(
                         controller: _replacementTextEditingController,
                         style: const TextStyle(
@@ -351,15 +351,11 @@ class _MyHomePageState extends State<MyHomePage> {
                       ),
                     ),
                   ),
-                ),
                   Expanded(
                     child: Column(
                       children: [
                         _buildTextEditingDeltaViewHeader(),
                         Expanded(
-                        child: TextEditingDeltaHistoryManager(
-                          history: _textEditingDeltaHistory,
-                          updateHistoryOnInput: _updateTextEditingDeltaHistory,
                           child: Builder(
                             builder: (innerContext) {
                               final TextEditingDeltaHistoryManager manager =
@@ -381,7 +377,6 @@ class _MyHomePageState extends State<MyHomePage> {
                             },
                           ),
                         ),
-                      ),
                         const SizedBox(height: 10),
                       ],
                     ),
@@ -391,6 +386,7 @@ class _MyHomePageState extends State<MyHomePage> {
             ),
           ),
         ),
+      ),
     );
   }
 }

simplistic_editor/lib/text_editing_delta_history_manager.dart

@@ -18,7 +18,8 @@ class TextEditingDeltaHistoryManager extends InheritedWidget {
   static TextEditingDeltaHistoryManager of(BuildContext context) {
     final TextEditingDeltaHistoryManager? result = context
         .dependOnInheritedWidgetOfExactType<TextEditingDeltaHistoryManager>();
-    assert(result != null, 'No ToggleButtonsStateManager found in context');
+    assert(
+        result != null, 'No TextEditingDeltaHistoryManager found in context');
     return result!;
   }