Update Commentary header.
(tree-widget-theme-name): Ignore parent themes. (tree-widget-set-parent-theme): New function. (tree-widget-set-theme): Use it. (tree-widget-set-image-properties): Move definition. Does nothing if image properties have already been set. (tree-widget-image-properties): Move definition. Receive an image name. Set the :pointer property. (tree-widget-lookup-image): Doc fix. Search in parent themes. Don't set the :pointer image property. (tree-widget-convert-widget): New function. Handle :dynargs compatibility here. (tree-widget): Use it to :convert-widget. Add the :expander-p predicate to control when the :expander function is entered. Thanks to Ken Manheimer <email@example.com> for the idea. (tree-widget-value-create): Handle :expander-p. widget-apply :expander. (tree-widget-expander-p): New function. Default value of the :expander-p property.
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