fix: insertContent keeps marks when using plain text, fix #2406

packages/core/src/commands/insertContentAt.ts

@@ -53,6 +53,7 @@ export const insertContentAt: RawCommands['insertContentAt'] = (position, value,
       ? { from: position, to: position }
       : position
 
+    let isOnlyTextContent = true
     let isOnlyBlockContent = true
     const nodes = isFragment(content)
       ? content
@@ -62,6 +63,10 @@ export const insertContentAt: RawCommands['insertContentAt'] = (position, value,
       // check if added node is valid
       node.check()
 
+      isOnlyTextContent = isOnlyTextContent
+        ? node.isText && node.marks.length === 0
+        : false
+
       isOnlyBlockContent = isOnlyBlockContent
         ? node.isBlock
         : false
@@ -84,7 +89,13 @@ export const insertContentAt: RawCommands['insertContentAt'] = (position, value,
       }
     }
 
-    tr.replaceWith(from, to, content)
+    // if there is only plain text we have to use `insertText`
+    // because this will keep the current marks
+    if (isOnlyTextContent) {
+      tr.insertText(value as string, from, to)
+    } else {
+      tr.replaceWith(from, to, content)
+    }
 
     // set cursor at end of inserted content
     if (options.updateSelection) {