Closes a dialog. When there is no dialog open then nothing happens.

Example, closing the top-most dialog:

{% button text="cancel" action={dialog_close} %}

This button closes any open dialog when clicked.

There can be many levels of dialogs open, they are designated by a level, the default dialog opens at level 0. Higher levels are displayed above lower levels.

To close all open dialogs, pass level 0:

{% button text="cancel" action={dialog_close level=0} %}

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