support hierarchical indentation in select element. #11
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Current codebase doesn't support indentation in the select dropdown for hierarchical taxonomies. For example, consider the following taxonomy:
Term 1
Subterm 1.a
Subterm 1.b
Term 2
Select dropdown will show up as:
Term 1
Subterm 1.a
Subterm 1.b
Term 2
This pull request mimics class Walker_CategoryDropdown from WordPress core to add indentation.