IsWayland value can be cached

[AlexTP]

Code: Pascal  [Select][+][-]

1. function IsWayland: Boolean;
2. var
3.   APlatform: WideString;
4. begin
5.   Result := False;
6.   QGuiApplication_platformName(@APlatform);
7.   Result := APlatform = 'wayland';
8.   // not QX11Info_isPlatformX11() and (GetEnvironmentVariable('XDG_SESSION_TYPE') = 'wayland');
9. end;

Can we cache the function res to a global variable, ie call the function only once? Now it's called 100 times from different places of Qt5 WS.