Method ViewportSize

src/ProjectWindow.cpp:455–456

   ~Adapter() override = default;

   std::pair<int, int> ViewportSize() const override
   { return IsWindowValid(mwWindow) ? mwWindow->ViewportSize() : std::pair{ 1, 1 }; }

   unsigned MinimumTrackHeight() override
   { return IsWindowValid(mwWindow) ? mwWindow->MinimumTrackHeight() : 0; }