ReadonlyactiveReadonlyelementReadonlyopenReadonlyreadyResolves once the persisted tabs have been restored and a document is loaded.
Write the active document to the store now, if it has unsaved edits.
Create a document (blank, or from a template) and open it.
Optionaltemplate: DocumentTemplateOpen a document in a tab (if not already) and switch to it.
Re-render from the store. Called automatically on store changes.
Open tab ids in strip order (pinned first).