The macro with-atomic-redisplay
delays the updating of the specified panes and their descendants until the exit from the with-atomic-redisplay
macro.
Most CAPI pane slot writers update the visual appearance of the pane at the point that their state changes, but it is sometimes necessary to cause all updates to the pane to be left until after they are all completed. The macro with-atomic-redisplay
defers all visible changes to the state of each pane in
panes
until the end of the scope of the macro.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017