# GimpUi.Preview.prototype.invalidate

    function invalidate(): void {
        // Gjs wrapper for gimp_preview_invalidate()
    }

This function starts or renews a short low-priority timeout. When the timeout expires, the GimpPreview::invalidated signal is emitted which will usually cause the preview to be updated.

This function does nothing unless the "Preview" button is checked.

During the emission of the signal a busy cursor is set on the toplevel window containing the preview and on the preview area itself.

Since 2.2