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Custom dialogs, timeouts etc.

def update(self, *args):
    timeout_add(500, self.update, self)

    exists, x1, y1, x2, y2 = \
        pdb.gimp_selection_bounds(self.img)
    if not exists or not self.changed() :
        return     # No selection: can't draw an arrow

    # Clear the layer, erasing the old arrow
    self.layer.fill(TRANSPARENT_FILL)

    # Draw the new arrow.
    self.arrow(x1, y1, x2, y2, self.direction)

    pdb.gimp_displays_flush()
From arrowdesigner.py