Deprecate AUI liferay-tree-view-icons

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: Alloy UI
• Labels: None
• Epic/Theme:
  • FI_Technical_Debt
• Epic Link: fi-modernize-aui-2020-05
• Sprint: S03E24 - Wuhan, S03E25 - Pango
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/89102

Aim here is to mark liferay-tree-view-icons as deprecated:

https://github.com/liferay/liferay-portal/blob/master/modules/apps/frontend-js/frontend-js-aui-web/src/main/resources/META-INF/resources/liferay/tree_view_icons.js

Replaced by the React Treeview component:

https://github.com/liferay/liferay-portal/blob/master/modules/apps/frontend-js/frontend-js-components-web/test/treeview/Treeview.js

liferay-tree-view-icons is activated when aui-tree-view is used, which means that in order to effectively deprecate it we need to do three things:

1. Verify that existing usage sites of aui-tree-view can be ported to React Treeview (this may require changes to the React Treeview, or flexibilization of the requirements where aui-tree-view is being used).
2. Actually port those aui-tree-view usages sites to React. Sample results for "git grep aui-tree-view": https://gist.github.com/wincent/a87224f87282de5608ebdfc0bd312f3b (note that anything under "modules/apps/archived" can be ignored)
3. Mark liferay-aui-tree-view-icons as deprecated.

Note that step "1" is very important: at the time I write this, I haven't even looked at the usage sites, so it is speculation that React Treeview can be used in its current form to replace aui-tree-view; we may have to spin off another task (or tasks) to make adaptations or additions to that API.