GUI: fix fancy toolbars under Linux
|Status:||Resolved||Start date:||05 May 2020|
|Target version:||Sprint 43|
With Qt5.14 BornAgain GUI suddenly started to look as on the screenshot below.
Try to fix QMenuBar and QToolBar.
The problem here might arise from our ManhattanStyle, which is ancient piece of borrowed code to have fancy Juelich-like gradients.