Fix node bool containsOffset(int offset)

lib/models/documents/nodes/node.dart

@@ -57,12 +57,13 @@ abstract class Node extends LinkedListEntry<Node> {
   }
 
   int getDocumentOffset() {
-    return parent is! Root ? parent.getDocumentOffset() : 0 + getOffset();
+    final parentOffset = (parent is! Root) ? parent.getDocumentOffset() : 0;
+    return parentOffset + getOffset();
   }
 
   bool containsOffset(int offset) {
-    return getDocumentOffset() <= offset &&
+    final o = getDocumentOffset();
-        offset < getDocumentOffset() + this.length;
+    return o <= offset && offset < o + length;
   }
 
   @override

lib/widgets/raw_editor.dart

@@ -585,7 +585,7 @@ class RawEditorState extends EditorState
         result.add(editableTextLine);
       } else if (node is Block) {
         Map<String, Attribute> attrs = node.style.attributes;
-        result.add(EditableTextBlock(
+        EditableTextBlock editableTextBlock = EditableTextBlock(
             node,
             _textDirection,
             _getVerticalSpacingForBlock(node, _styles),
@@ -597,7 +597,8 @@ class RawEditorState extends EditorState
                 ? EdgeInsets.all(16.0)
                 : null,
             widget.embedBuilder,
-            _cursorCont));
+            _cursorCont);
+        result.add(editableTextBlock);
       } else {
         throw StateError('Unreachable.');
       }

lib/widgets/text_block.dart

@@ -75,7 +75,7 @@ class EditableTextBlock extends StatelessWidget {
     int index = 0;
     for (Line line in block.children) {
       index++;
-      children.add(EditableTextLine(
+      EditableTextLine editableTextLine = EditableTextLine(
           line,
           _buildLeading(context, line, index, count),
           TextLine(
@@ -91,7 +91,8 @@ class EditableTextBlock extends StatelessWidget {
           enableInteractiveSelection,
           hasFocus,
           MediaQuery.of(context).devicePixelRatio,
-          cursorCont));
+          cursorCont);
+      children.add(editableTextLine);
     }
     return children.toList(growable: false);
   }