put default value in rename file/folder form

examples/bootstrap4/main.py

@@ -3,6 +3,7 @@
 
 from flask import Flask
 from flask_admin import Admin
+from flask_admin.contrib.fileadmin import FileAdmin
 from flask_admin.contrib.sqla import ModelView
 from flask_admin.menu import MenuDivider
 from flask_admin.menu import MenuLink
@@ -64,6 +65,13 @@ class UserAdmin(CustomView):
     page_size = 7
 
 
+class FileAdminModal(FileAdmin):
+    rename_modal = True
+    edit_modal = True
+    mkdir_modal = True
+    upload_modal = True
+
+
 def build_sample_db():
     """
     Populate a small db with some example entries.
@@ -223,6 +231,11 @@ def build_sample_db():
         )
     )
 
+    admin.add_view(FileAdmin("files/", name="Local Files", category="Menu"))
+    admin.add_view(
+        FileAdminModal("files/", name="Local Files with Modals", category="Menu")
+    )
+
     admin.add_link(
         MenuLink(
             name="link1",

flask_admin/contrib/fileadmin/__init__.py

@@ -1194,6 +1194,10 @@ def rename(self) -> T_RESPONSE | str:
         form = self.name_form()
 
         path = form.path.data  # type: ignore[attr-defined]
+
+        if request.method == "GET" and hasattr(form, "name"):
+            form.name.data = op.basename(path)
+
         if path:
             base_path, full_path, path = self._normalize_path(path)
 
@@ -1241,6 +1245,8 @@ def rename(self) -> T_RESPONSE | str:
             return redirect(return_url)
         else:
             helpers.flash_errors(form, message="Failed to rename: %(error)s")
+            if hasattr(form, "name"):
+                form.name.data = op.basename(path)
 
         if self.rename_modal and request.args.get("modal"):
             template = self.rename_modal_template

flask_admin/tests/fileadmin/test_fileadmin.py

@@ -41,6 +41,7 @@ class MyFileAdmin(fileadmin_class):  # type: ignore[valid-type, misc]
             rv = client.get("/admin/myfileadmin/rename/?path=dummy.txt")
             assert rv.status_code == 200
             assert "dummy.txt" in rv.data.decode("utf-8")
+            assert 'value="dummy.txt"' in rv.data.decode("utf-8")
 
             rv = client.post(
                 "/admin/myfileadmin/rename/?path=dummy.txt",