Make indent for Tree's nodes adjustable via CSS.
Make indent for Tree's nodes adjustable via CSS.

Since dojo.marginBox() doesn't work reliably until the Tree's DOM node is inserted into the document and is visible, the CSS width is read when Tree.resize() is called.   If Tree.resize() isn't called then it defaults to 19px, as before (for backwards compatibility).

Fixes #9078 !strict.

git-svn-id: 674a2d6b1e32e53f607eb824547723f32280967e@17543 560b804f-0ae3-0310-86f3-f6aa0a117693

Sam-Cummins/delite,harbalk/delite,kitsonk/delite,Sam-Cummins/delite,harbalk/delite,kitsonk/delite