return-nil-from-pop-up-dialog

Arguments: widget new-value old-value

The default on-click function for a cancel-button.

This function simply calls flag-modal-completion with a value argument of nil, if the widget's parent dialog is currently being invoked in the current process by a call to pop-up-modal-dialog. Otherwise it does nothing.

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This page was not revised from the 10.0 page.
Created 2019.8.20.