Fix non-virtualizing stack layout alignment.
Fix non-virtualizing stack layout alignment.

We need to return the max of the bounds and the constraint, otherwise horizontal/vertical alignment doesnt work correctly.

SuperJMN/Avalonia,SuperJMN/Avalonia,jkoritzinsky/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,wieslawsoltes/Perspex,AvaloniaUI/Avalonia,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,SuperJMN/Avalonia,wieslawsoltes/Perspex,wieslawsoltes/Perspex,SuperJMN/Avalonia,jkoritzinsky/Avalonia,jkoritzinsky/Perspex,jkoritzinsky/Avalonia,wieslawsoltes/Perspex,AvaloniaUI/Avalonia,grokys/Perspex,SuperJMN/Avalonia,Perspex/Perspex,Perspex/Perspex,wieslawsoltes/Perspex,grokys/Perspex,wieslawsoltes/Perspex,jkoritzinsky/Avalonia,SuperJMN/Avalonia,jkoritzinsky/Avalonia,akrisiun/Perspex,SuperJMN/Avalonia,AvaloniaUI/Avalonia,jkoritzinsky/Avalonia,wieslawsoltes/Perspex