Live filtering

A Search window is present on the toolbar. When I start typing text into it, rows containing the typed text are filtered. I can select those rows and copy them.

Start by locating the toolbar's Search window implementation and the code that displays and selects rows. Check how typed text should filter visible rows while preserving selection and copying. Done means matching rows update as text is entered, can be selected, and can be copied.

Written by the indexing model from the issue text.