[bisq-network/bisq] Bisq app black screen when left idle (#3336)

[RogueCoder]

After leaving bisq idle for 12+ hours, on displaying the app, the app display is black.  Trying to close the app I do finally get a warning about open offers.  It seems that only the base window has lost its canvas.    

Windows 10, 64 bit, bisq 1.1.7

Are there any logs I can share?

![image](https://user-images.githubusercontent.com/575732/65770466-2944bc00-e104-11e9-9a5d-4d9a399fcf21.png)

![image](https://user-images.githubusercontent.com/575732/65770644-80e32780-e104-11e9-82ed-e3fa055c6036.png)


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