cleanup one test and workingset view extensibility
mutable file object for wsv item class
fix comment
rework classes array
allow refresh to update the class list without rebuilding the entire view
update doc to support jQuery for IconProvider
update comment
update comment again
remove unused var in test
Clear selection, context and rename for deleted files.

Fix for #9214.
- filter only [Extension] console output for the ExtensionLoader tests
Clear file tree context when context menu item is selected.

This is a fix for #9228.
Fix click handling for file tree rename inputs.

Fix for #9217.
context mouse down was blocking clicks on the rename input.
Add missing space in classes on file node.

Fix for #9264.
merge with master
rtc:nits
Merge branch 'master' into jeff/wsv-extensibility
Make sure context bar is positioned properly when focused on working set.
Replace magic number 2 with a MIDDLE_MOUSE_BUTTON constant