The following custom function was added for this purpose. See documentation for custom functions for details about how to override such functions.

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This function prints the custom buttons on the current view page based on specified bug id

and the context. The printing of the buttons will typically call html_button() from

html_api.php. For each button, this function needs to generate the enclosing '<td>' and '</td>'.

function custom_function_default_print_bug_view_page_custom_buttons( $p_bug_id ) {
}