[GSoC 2020] Fix bug with loading panel states for each backends between...

[GSoC 2020] Fix bug with loading panel states for each backends between program runs - restoring state while loading now works correct
1 job for master in 27 minutes and 7 seconds (queued for 2 minutes and 49 seconds)
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passed linux kf5-qt5 qt5.12 #58033

00:27:07

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