Fix udecode#2230: Stop accidental infinite recursion (udecode#2233)

* Add check for `then` being replaced

* adjust white space

* Change to be a limit of the number of times then can be replaced.

* Create .changeset/nasty-cougars-hear.md

---------

Co-authored-by: Ziad Beyens <ziad.beyens@gmail.com>

.changeset/nasty-cougars-hear.md

@@ -0,0 +1,5 @@
+---
+"@udecode/plate-core": patch
+---
+
+Fixes #2230: infinite recursion when using plugin field `then`

packages/core/src/types/plugin/PlatePlugin.ts

@@ -187,6 +187,11 @@ export type PlatePlugin<
       plugin: WithPlatePlugin<P, V, E>
     ) => Partial<PlatePlugin<P, V, E>> | void;
 
+    /**
+     * For internal use. Tracks if then has been replaced for recursive calls.
+     */
+    _thenReplaced?: number;
+
     /**
      * Hook called when the editor is initialized.
      */

packages/core/src/utils/plate/overridePluginsByKey.ts

@@ -49,15 +49,23 @@ export const overridePluginsByKey = <
   const { then } = plugin;
 
   if (then) {
-    // override plugin.then
-    plugin.then = (editor, p) => {
-      const pluginThen = { key: plugin.key, ...then(editor, p) };
-
-      return defaultsDeep(
-        overridePluginsByKey(pluginThen as any, overrideByKey),
-        pluginThen
-      );
-    };
+    if(typeof plugin._thenReplaced === 'undefined') {
+      plugin._thenReplaced = 0;
+    }
+    // Limit the number of times that `then` can be replaced.
+    // otherwise we will accidentally create a stack overflow.
+    // There is probably a better solution for this.
+    if((plugin._thenReplaced as number) < 3) {
+      // override plugin.then
+      plugin.then = (editor, p) => {
+        const pluginThen = { key: plugin.key, ...then(editor, p) };
+        return defaultsDeep(
+          overridePluginsByKey(pluginThen as any, overrideByKey),
+          pluginThen
+        );
+      };
+      (plugin._thenReplaced as number)++;
+    }
   } else if (overrideByKey[plugin.key]?.then) {
     // TODO: recursvie
     plugin.then = overrideByKey[plugin.key].then as any;