fix: one content tab of main window is now always selected (cannot unselect tab by clicking on selected tab header and get empty main window)
fix: one content tab of main window is now always selected (cannot unselect tab by clicking on selected tab header and get empty main window)

l0g0sys/PoESkillTree,brather1ng/PoESkillTree,PoESkillTree/PoESkillTree,MLanghof/PoESkillTree,EmmittJ/PoESkillTree,Yskuma/PoESkillTree,nikibobi/PoESkillTree,BlueManiac/PoESkillTreeSource,mihailim/PoESkillTree