fix(markdown): remove empty links when text is deleted (#7702)

When a user deletes all text within a link in the visual markdown
editor, the empty link markup was being left behind (visible when
switching to raw markdown mode).

This adds a Slate normalizer that automatically removes link nodes
when they become empty (have no text content), ensuring the link
markup is properly cleaned up along with the text.

Fixes #7640

Author: EricGrill

packages/decap-cms-widget-markdown/src/MarkdownControl/plugins/inlines/withInlines.js

@@ -1,14 +1,32 @@
+import { Element, Node, Transforms } from 'slate';
+
 import keyDown from './events/keyDown';
 
 function withInlines(editor) {
-  const { isInline, isVoid } = editor;
+  const { isInline, isVoid, normalizeNode } = editor;
 
   editor.isInline = element =>
     ['link', 'button', 'break', 'image'].includes(element.type) || isInline(element);
 
   editor.isVoid = element =>
     ['break', 'image', 'thematic-break'].includes(element.type) || isVoid(element);
 
+  // Remove empty links (fixes #7640: hidden link remains when deleting linked text)
+  editor.normalizeNode = entry => {
+    const [node, path] = entry;
+
+    if (Element.isElement(node) && node.type === 'link') {
+      // Check if link is empty (no text content)
+      const text = Node.string(node);
+      if (text === '') {
+        Transforms.removeNodes(editor, { at: path });
+        return;
+      }
+    }
+
+    normalizeNode(entry);
+  };
+
   if (editor.keyDownHandlers === undefined) {
     editor.keyDownHandlers = [];
   }