callback
The command procedure to be executed when a row/column of table_window is selected or de-selected. This is invoked only when the window has been created "selectable" via the -sel switch to the wtable command.
The window identifier is passed to the procedure as parameter 1. The row/column number, a numeric value, is passed as parameter 2. The new state of the row/column is passed as parameter 3, a value of 1 indicating that the row/column is now selected, a value of 0 indicating that the row/column is now de-selected.
New table windows have a .select procedure of null.
window.select (<window>,<row>,<state>)
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