Breaking: #79196 - Toolbar item event handling changed 

See forge#79196

Description 

With the introduction of the topbar reloading mechanism, the event handling of toolbar items has changed. Reason is that the event information gets lost, as the whole topbar is rendered from scratch after a reload.

Impact 

After reloading the topbar, non-migrated events will not get triggered anymore.

Affected Installations 

All installations with old-fashioned toolbar item registrations.

Migration 

In most cases it's sufficient to replace the register function with Viewport.Topbar.Toolbar.registerEvent().

Example:

define(['jquery', 'TYPO3/CMS/Backend/Viewport'], function($, Viewport) {
   // old registration
   MyAwesomeItem.doStuff)

   // new registration
   Viewport.Topbar.Toolbar.registerEvent(MyAwesomeItem.doStuff);
});
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