put DND CSS classes into theme

[bill]

Currently the unofficial "theme" for DND is defined in source:dojo/trunk/tests/dndDefaults.css but it should be part of each theme for dijit.

Also, could cleanup the CSS some. For example, the avatar has a rectangle surrounded by a rounded rectangle (Eugene says this looks really bad.)

It's also possible using simple CSS rules that during drag, to tone down all irrelevant elements on the page highlighting all valid targets, which is a good usability feature especially for visually impaired .

Note that the themes do already have some DnD classes, see source:dijit/trunk/themes/tundra/Common.css, but it doesn't define things like dojoDndItemSelected. In any case, source:dijit/trunk/tests/test_Tree_Notification_API_Support.html and source:dijit/trunk/tests/tree/test_Tree_DnD.html should not be importing dndDefault.css.

[elazutkin]

#6395 is the dup. But it assumes the default DnD CSS, which will be overridden by themes.

[nonken]

To enable easier styling we need to put a separate "test" with the markup being statically on a page, it is very hard otherwise to style and improve the interface