Fix dropdown menus hidden by FOUC CSS specificity regression (#835)

[drale1]

Linked issues

#835

https://www.drupal.org/project/dxpr_theme/issues/3610960

Solution

The 8.1.3 FOUC rule .dxpr-theme-header ul.dropdown-menu { display: none; } has higher specificity than Bootstrap’s .dropdown-menu.show, so open dropdowns stay hidden.

Updated the inline FOUC style in templates/html.html.twig to .dxpr-theme-header ul.dropdown-menu:not(.show) { display: none; }, so closed menus still avoid FOUC while open menus can display.

Checklist

• I have read the CONTRIBUTING.md document.
• My commit messages follow the contributing standards and style of this project.
• My code follows the coding standards and style of this project.
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Need to run update.php after code changes
• Requires a change to end-user documentation.
• Requires a change to developer documentation.
• Requires a change to QA tests.
• Requires a new QA test.
• I have updated the documentation accordingly.
• All new and existing tests passed.