[workbench] Add support for tray icons
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3264994. --> Reported by: [jmoruzi](https://www.drupal.org/user/419998) Related to !145 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Workbench Tray drop down menu icons broken.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>With the Gin theme and Workbench enabled there is a Workbench dropdown menu created in the secondary admin toolbar at the top right of admin pages. The dropdown menu looks like it should have icons displayed to the left of the menu items but the icons are broken.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Don't have a solution. Not a major issue, it only affects the appearance of the menu.</p>
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