Bisected to 67155d9299ef75cc73272a259dbfbf72632c3020
Before (good)
After (ugly) 
Bisected to 67155d9299ef75cc73272a259dbfbf72632c3020
Before (good)
After (ugly) 
Hm yes some padding values for the extra widgets/layouts should be set to zero here.
Is this hard to fix?
Can be closed now :).