Add disable arg or attributes arg to wp_dropdown_categories() & wp_dropdown_pages()

[wpsmith]

It would be beneficial to be able to add disabled="disabled" attribute to the select tag or add multiple attributes to the select tag.

Related: #20156, #20167

[wpsmith]

Disabled arg for wp_dropdown_categories()

[wpsmith]

Extra attributes for wp_dropdown_categories()

[wpsmith]

Disabled arg for wp_dropdown_pages()

[wpsmith]

Extra attributes for wp_dropdown_pages()

[prionkor]

+1 we need it on all dropdown functions.

[lumpysimon]

+1 for this, I'm having to use jQuery at the moment to achieve this.

[johnbillion]

Patch needs a refresh.

[garrett-eclipse]

+1
Currently utilizing jQuery or rebuilding the $output through the wp_dropdown_cats filter.

This PR adds a disabled boolean argument to both wp_dropdown_categories() and wp_dropdown_pages(). When set to true, the generated <select> dropdowns are rendered with the HTML5 disabled attribute (<select disabled>).

Trac ticket: #20810