Update logic

lib/src/models/documents/document.dart

@@ -160,12 +160,12 @@ class Document {
     // Bug: When the caret is in the middle of the paragraph
     // and at the end of the format string, it will display the wrong state
     // of the format button
-    final isNotLinkStyle =
-        res.node?.style.attributes[Attribute.link.key]?.value == false;
+    final isLinkStyle =
+        res.node?.style.attributes[Attribute.link.key]?.value == true;
     // In this case, we have an exception, this is a link.
     // When node is a link we will not -1
     return (res.node as Line).collectStyle(
-        len == 0 && res.node != null && isNotLinkStyle
+        len == 0 && res.node != null && !isLinkStyle
             ? res.offset - 1
             : res.offset,
         len);