Filters the first-row list of TinyMCE buttons (Visual tab).
Parameters
$mce_buttonsarray- First-row list of buttons.
$editor_idstring- Unique editor identifier, e.g.
'content'. Accepts'classic-block'when called from block editor’s Classic block.
Source
$mce_buttons = apply_filters( 'mce_buttons', $mce_buttons, $editor_id );
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