extensions clone depth 1

modules/ui_extensions.py

@@ -345,12 +345,12 @@ def install_extension_from_url(dirname, url, branch_name=None):
         shutil.rmtree(tmpdir, True)
         if not branch_name:
             # if no branch is specified, use the default branch
-            with git.Repo.clone_from(url, tmpdir) as repo:
+            with git.Repo.clone_from(url, tmpdir, depth=1) as repo:
                 repo.remote().fetch()
                 for submodule in repo.submodules:
                     submodule.update()
         else:
-            with git.Repo.clone_from(url, tmpdir, branch=branch_name) as repo:
+            with git.Repo.clone_from(url, tmpdir, depth=1, branch=branch_name) as repo:
                 repo.remote().fetch()
                 for submodule in repo.submodules:
                     submodule.update()