3550536 Prevent creating double table and table cell properties button in the...

Wojciech Kukowskirequested to merge
issue/ckeditor5_plugin_pack-3550536:3550536-prevent-table-and-cell-properties-toolbar-duplicate into 1.4.x

3550536 Prevent creating double table and table cell properties button in the table contextual toolbar

Closes #3550536

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