Fatal Error: Call to undefined method ConnectException::getResponse() in ApiAdapter::sendRequest()

Problem/Motivation

When the CKEditor Cloud Service is unreachable (e.g. connection timeout, DNS failure), Guzzle throws a ConnectException. The sendRequest() method in ApiAdapter catches GuzzleException (the common interface) and calls $e->getResponse() on it. However, ConnectException does not implement getResponse() — only RequestException does. This causes a fatal PHP Error that crashes the node edit form validation for logged-in editors.

Stack trace:

Error: Call to undefined method GuzzleHttp\Exception\ConnectException::getResponse()
in ckeditor5_premium_features/src/Utility/ApiAdapter.php

Steps to reproduce

Install and configure ckeditor5_premium_features with realtime collaboration.
Make the CKEditor Cloud Service unreachable (e.g. block the API endpoint or use an invalid API URL).
Open a node edit form that uses the configured text format.
Submit the form — a fatal PHP Error is thrown during form validation.

Proposed resolution

Split the single catch (GuzzleException $e) block into three separate catch blocks:

• ConnectException — handle without calling getResponse() (the method does not exist on this class)
• RequestException — safe to call getResponse() here
• GuzzleException — generic fallback for any other Guzzle error

A patch is attached.

Remaining tasks

Review and apply the patch
Add test coverage for ConnectException handling

User interface changes

API changes

Data model changes