The modality in the UserDialogBoxMorph is implemented via holding both mouse
and keyboard focus. The halo takes the mouse focus away when growing or
dragging a morph--without signaling it to the former focus holder. After
that, the modal behavior is lost. However, the dialog is still useful as
long as it is in the world because it still triggers a world's sub-cycle.

I guess that it is okay to hack it via halos for debugging reasons. :)

Best,
Marcel



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