Feature request - allow queries to be build by dragging column headers/cells

It would be a convenience if a query could be constructed just by dragging a column header or cell from the query result table to the query specifier. For example, dragging the "Timestamp" row header to the "add new clause" control might automatically add a clause where the field is set to "Timestamp". Dragging a cell might create a clause where the field is set to the column header and the value is set to the cell contents.

Start by locating the query result table and query specifier, especially the “add new clause” control described in the issue. Trace how column headers, cells, fields, and values are represented, then determine how dragging a header or cell should create a clause. Done means both described drag interactions construct the expected query clauses.