Product version is 1.2.8, sorry, forgot to include.

If you want I could provide a pull request for this fix. Pretty straightforward: add the following line in events_inc.php:

# Bug update events
'EVENT_UPDATE_BUG_FORM_TOP' => EVENT_TYPE_EXECUTE,
'EVENT_UPDATE_BUG_FORM' => EVENT_TYPE_EXECUTE,
'EVENT_UPDATE_BUG' => EVENT_TYPE_CHAIN,
<b>'EVENT_BUG_STATUS_UPDATE_FORM' => EVENT_TYPE_EXECUTE,</b>

and add this event to the bug_change_status_page.php:

<?php

<b>event_signal( 'EVENT_BUG_STATUS_UPDATE_FORM', array( $f_bug_id ) );</b>

if ( ON == $f_reopen_flag ) {
    # bug was re-opened
    printf("    <input type=\"hidden\" name=\"resolution\" value=\"%s\" />\n",  config_get( 'bug_reopen_resolution' ) );
}

?>

Sounds reasonable to me, but I'm no expert on plugins so you might want to get jreese's opinion on; try IRC #mantisbt or the mailing list, you'll have more chance to reach him.

Seems like a useful usecase. My only concern would be that the event name isn't consistent with the existing events. I would suggest EVENT_UPDATE_BUG_STATUS_FORM instead.

Suggested fix in pull request https://github.com/mantisbt/mantisbt/pull/54

Somehow the diff didn't work. Retried, looks better: https://github.com/mantisbt/mantisbt/pull/55

As discussed in the pull request [1], this is actually the same as 0010126 which has already been fixed in the master branch.

I will backport that commit to 1.2.x branch, and rename the event according to jreese's recommendation (0014329:0032316).

[1] https://github.com/mantisbt/mantisbt/pull/55#issuecomment-7440654

Marking as 'acknowledged' not resolved/closed to track that change gets ported to master-2.0.x branch