fix: Textarea enter_key_submit uses add_custom_code instead of _get_all_custom_code

The Textarea component's auto_height and enter_key_submit features relied on
overriding _get_all_custom_code to inject JavaScript helper functions. However,
the compiler's builtin plugin collects custom code via _get_custom_code (singular)
and add_custom_code, not _get_all_custom_code (plural). This caused both
autoHeightOnInput and enterKeySubmitOnKeyDown to be missing from compiled pages,
resulting in ReferenceError at runtime.

Fix by implementing add_custom_code (the intended mechanism for injecting
module-level JS) and removing the _get_all_custom_code override, since the
parent class already merges add_custom_code results into _get_all_custom_code.

Fixes #6482

Author: algojogacor

packages/reflex-components-core/src/reflex_components_core/el/elements/forms.py

@@ -769,18 +769,22 @@ def _exclude_props(self) -> list[str]:
             "enter_key_submit",
         ]
 
-    def _get_all_custom_code(self) -> dict[str, None]:
-        """Include the custom code for auto_height and enter_key_submit functionality.
+    def add_custom_code(self) -> list[str]:
+        """Add custom Javascript code for auto_height and enter_key_submit.
+
+        Custom code is inserted at module level, after any imports. Each string
+        is deduplicated per-page, so the same const or function is only
+        included once even when multiple Textarea components are on the page.
 
         Returns:
-            The custom code for the component.
+            The additional custom code for this component.
         """
-        custom_code = super()._get_all_custom_code()
+        code: list[str] = []
         if self.auto_height is not None:
-            custom_code[AUTO_HEIGHT_JS] = None
+            code.append(AUTO_HEIGHT_JS)
         if self.enter_key_submit is not None:
-            custom_code[ENTER_KEY_SUBMIT_JS] = None
-        return custom_code
+            code.append(ENTER_KEY_SUBMIT_JS)
+        return code
 
 
 button = Button.create