Outline view filter-specific data

The following <tab> tag attributes refer specifically to Outline view's Filter feature:

• showFilter. Show/hide the view's Filter panel. Boolean as number. Default is 0 (hidden).
• filterString. The last-used Filter query—if any. Default value is an empty string.
• filterName. The saved name—if any—of the last-used Filter query. Default value is an empty string.