Use underscore-plus
Set package menu

So the package loads right
Add/remove PreviewTabsViews to panes upon activation/deactivation
Test adding and removing panes
Remove all PreviewTabsViews from array after deactivation
Don't bother with null check on `@previewTabsViews`
Don't test via DOM
Don't worry about beforeEach blocks in simple tests
Take a paneView in the constructor of a PreviewTabsView
When adding a new pane item attach a PreviewTabsPreview

And cleanup when closing the pane
Add class for wrapping jQuery style events
Add event handler for double clicking tabs
Remove double click handler from PreviewTabsView

Will add to PreviewTabsPreview
Test event handler wrapper
Use fat arrow for callbacks
Add handler for when a tree entry is double clicked
Simplify tree double click handler

Tell, don’t ask
Add simple preview class

Logs events to console
Extract waiting for item to be ready into a utility function
Keep previews on save, change, and double click