Query a frame's model only once whether it is a preview model, instead of
doing it for each toolbar and menubar and statusbar and progressbar. Each call
via SfxBaseModel::getArgs() results in SfxObjectShell::GetVisArea() that at
least in Calc determines how far visible attributes extend, with several
toolbars requested on each cell edit.

getArgs() calls GetVisArea() still too many times when loading a document even
if the caller doesn't evaluate the WinExtent property, this is an opportunity
for further optimization.