Tree: replace icons w/something more colorful

[bill]

• Problem: refine design of treeview icons ( e.g. open folder opens wrong direction; +/- icons- competing gradient style to the folder icons)

• Recommendation: Use open source Eclipse folder and +/-icons. (see revised assets)

Current:

New:

Taken from ​IBM Design Leadership recommendations.

[bill]

We'll need to talk about this one. Tundra was specifically designed to be drab so that it matches any corporate color scheme, like IBM's blue or Sitepen's green (ie, the main color used on the website). Not sure if this defeats that purpose. Note that other themes like nihilo have different icons already: ​http://download.dojotoolkit.org/release-1.1.0/dojo-release-1.1.0/dijit/tests/test_Tree.html?theme=nihilo

[bill]

PS: also need to make sure licensing is OK. Dojo usually asks for images to be explicitly donated, even if they come from open source.

[bill]

Apparently licensing is OK if we add a license file, see http://dojotoolkit.org/book/dojo-book-0-4/part-9-dojo-community/intellectual-property-policies and ​http://article.gmane.org/gmane.comp.web.dojo.devel/8531

As per LnF, note that 0.4 (see ​http://download.dojotoolkit.org/release-0.4.2/dojo-0.4.2p1-widget/tests/widget/treeV3/docIcon1.html) had colorful icons but we intentionally changed them to gray (AFAICT) to make them blend better with various color schemes.

[Adam Peller]

I'm not crazy about the Eclipse icons, personally. We could just incorporate some of this input for Tundra by flipping the icons and reconsidering the gradients (I think I like the gradients)

Also, I'd hate to include a license file just for one set of icons. Even though there shouldn't be any issue here, it complicates our licensing situation by just having another reference to consider.

[bill]

[14102] - refs #6635 - at a minimum, flip the open and closed icons horizontally so they open "the right way". does this have RTL implications? seems entirely aesthetic, so my guess is: no.

[bill]

I asked Torrey about this and he said he didn't have any strong views; he said "I think the yellow probably stands out a little more which might be better for a tree component". So, Nikolai, it's up to you. At a minimum we should flip the gradient on the open icon so it matches the closed icon and the folder icons.

As Adam said it's not worth including a LICENSE file when we can change the icons ourselves.

[nonken]

Until we decide about whether to use the fam fam icon set or not we should stick to the icon we have. Agree though that current tree icons are a bit grey

[bill]

This has been done for the new claro theme, not worth doing for tundra (especially if tundra users don't want to change).