Fix #3720, model-from add isCreating isEditing methods

src/Form.php

@@ -1353,6 +1353,26 @@ public function header(Closure $callback = null)
         $callback->call($this, $this->builder->getTools());
     }
 
+    /**
+     * Indicates if current form page is creating.
+     *
+     * @return bool
+     */
+    public function isCreating()
+    {
+        return Str::endsWith(\request()->route()->getName(), '.create');
+    }
+
+    /**
+     * Indicates if current form page is editing.
+     *
+     * @return bool
+     */
+    public function isEditing()
+    {
+        return Str::endsWith(\request()->route()->getName(), '.edit');
+    }
+
     /**
      * Disable form submit.
      *