Issue #2350289 by mitrpaka: Replace extend of deprecated DrupalUnitTestBase with KernelTestBase in CKEditor.
Issue #2350315 by mitrpaka: Replace extend of deprecated DrupalUnitTestBase with KernelTestBase in Editor.
Issue #2342633 by Wim Leers, wwalc: Fixed CKEditor context menu broken due to an error in the drupalimage plugin.