Document wxWindow::GetMagnificationFactor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74258 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Add flags for SendSizeEvent

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74259 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
GetMagnificationFactor --> GetContentScaleFactor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74260 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775