fix: remove node before hr if it’s an empty text block (fix #1665)

packages/extension-horizontal-rule/src/horizontal-rule.ts

@@ -43,14 +43,32 @@ export const HorizontalRule = Node.create<HorizontalRuleOptions>({
     return {
       setHorizontalRule: () => ({ chain }) => {
         return chain()
+          // remove node before hr if it’s an empty text block
+          .command(({ tr, dispatch }) => {
+            const { selection } = tr
+            const { empty, $anchor } = selection
+            const isEmptyTextBlock = $anchor.parent.isTextblock
+              && !$anchor.parent.type.spec.code
+              && !$anchor.parent.textContent
+
+            if (!empty || !isEmptyTextBlock || !dispatch) {
+              return true
+            }
+
+            const posBefore = $anchor.before()
+
+            tr.deleteRange(posBefore, posBefore + 1)
+
+            return true
+          })
           .insertContent({ type: this.name })
+          // add node after hr if it’s the end of the document
           .command(({ tr, dispatch }) => {
             if (dispatch) {
               const { parent, pos } = tr.selection.$from
               const posAfter = pos + 1
               const nodeAfter = tr.doc.nodeAt(posAfter)
 
-              // end of document
               if (!nodeAfter) {
                 const node = parent.type.contentMatch.defaultType?.create()