Update simple toolbar

doc/todo.md

@@ -34,6 +34,7 @@ This is a todo list page that added recently and will be updated soon.
  - Fix the bugs of the font family and font size
  - Try to update Quill Html Converter
  - When pasting a HTML text from cliboard by not using the context menu builder, the new logic won't work
+ - Add strike-through in checkbox text when the checkpoint is checked
 
 ### Bugs
 

lib/src/widgets/quill/text_line.dart

@@ -164,7 +164,8 @@ class _TextLineState extends State<TextLine> {
       }
     }
     final textSpan = _getTextSpanForWholeLine();
-    final strutStyle = StrutStyle.fromTextStyle(textSpan.style!);
+    final strutStyle =
+        StrutStyle.fromTextStyle(textSpan.style ?? const TextStyle());
     final textAlign = _getTextAlign();
     final child = RichText(
       key: _richTextKey,
@@ -247,8 +248,11 @@ class _TextLineState extends State<TextLine> {
     return TextAlign.start;
   }
 
-  TextSpan _buildTextSpan(DefaultStyles defaultStyles, LinkedList<Node> nodes,
-      TextStyle lineStyle) {
+  TextSpan _buildTextSpan(
+    DefaultStyles defaultStyles,
+    LinkedList<Node> nodes,
+    TextStyle lineStyle,
+  ) {
     if (nodes.isEmpty && kIsWeb) {
       nodes = LinkedList<Node>()..add(leaf.QuillText('\u{200B}'));
     }

lib/src/widgets/toolbar/simple_toolbar.dart

@@ -133,6 +133,16 @@ class QuillSimpleToolbar extends StatelessWidget
           ),
           spacerWidget,
         ],
+        if (configurations.showStrikeThrough) ...[
+          QuillToolbarToggleStyleButton(
+            attribute: Attribute.strikeThrough,
+            options: toolbarConfigurations.buttonOptions.strikeThrough,
+            controller:
+                toolbarConfigurations.buttonOptions.strikeThrough.controller ??
+                    globalController,
+          ),
+          spacerWidget,
+        ],
         if (configurations.showInlineCode) ...[
           QuillToolbarToggleStyleButton(
             attribute: Attribute.inlineCode,
@@ -172,16 +182,6 @@ class QuillSimpleToolbar extends StatelessWidget
           ),
           spacerWidget,
         ],
-        if (configurations.showStrikeThrough) ...[
-          QuillToolbarToggleStyleButton(
-            attribute: Attribute.strikeThrough,
-            options: toolbarConfigurations.buttonOptions.strikeThrough,
-            controller:
-                toolbarConfigurations.buttonOptions.strikeThrough.controller ??
-                    globalController,
-          ),
-          spacerWidget,
-        ],
         if (configurations.showColorButton) ...[
           QuillToolbarColorButton(
             controller: toolbarConfigurations.buttonOptions.color.controller ??