SVGHMI: better handling of page switch fade-out.

- In cases or relative jump to current page, page was keeping black after switch.
- Now keep track of undergoing page switch without comparing subscribed page to visible page.

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from __future__ import absolute_import

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from etherlab.etherlab import *

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from util.BitmapLibrary import AddBitmapFolder

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import util.paths as paths

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AddBitmapFolder(os.path.join(paths.AbsDir(__file__), "images"))