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Closes #397. Fixed Viewer.show to return properly.
Viewer.show did not return a value, however ImageShow.show expected Viewer.show to return a non-falsey value if successful. Therefor ImageShow.show would continue to call multiple viewers.
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@ -65,7 +65,7 @@ class Viewer:
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if base != image.mode and image.mode != "1":
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if base != image.mode and image.mode != "1":
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image = image.convert(base)
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image = image.convert(base)
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self.show_image(image, **options)
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return self.show_image(image, **options)
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# hook methods
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# hook methods
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