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I have many hierarchical categories, some of which have the same names. Can I add collapsible categories functionality in the category selection widget in the admin interface?

I refer to the categories selection widget next to the posts edit screen in the admin interface.

From my front end (Mozilla, IE, Chrome) this widget is NOT collapsible, but offers a huge linear listing of categories, which is difficult to navigate. If that widget had little crosses to collapse branches, it would be easier to navigate large branches easier.

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Where exactly? Post editor meta box, category manager, term editor …? –  toscho Jul 24 '12 at 10:37
Post editor box, where you select the category/ies of the post. –  p.a. Jul 24 '12 at 10:48
Do you mean a dropdown with the categories? In which case, you'll only be able to select one... –  brasofilo Jul 24 '12 at 10:57
No, I mean a collapsible tree from which I will be able to select many different categories. Tree should initially be closed so that I navigate easily across major branches. –  p.a. Jul 24 '12 at 11:07
modified original question, thanks –  p.a. Jul 24 '12 at 12:52

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