Fixed initial content area size on uiWindows.
Fixed initial content area size on uiWindows.

hajimehoshi/ui,beni55/ui,ProtonMail/ui,mirrr/ui,hajimehoshi/ui,robbiev/ui,janstk/ui,mirrr/ui,292388900/ui,janstk/ui,292388900/ui,cainiaocome/ui,mirrr/ui,ProtonMail/ui,cainiaocome/ui,cainiaocome/ui,ProtonMail/ui,robbiev/ui,HunterChen/ui,beni55/ui,janstk/ui,292388900/ui,HunterChen/ui,hajimehoshi/ui,HunterChen/ui,beni55/ui,robbiev/ui