generate wxMoveEvent from wxPopupWindow::DoSetSize()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75865 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
remove stuff that is already done by gtk_window_set_transient_for()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75866 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
finish setting size before sending wxMoveEvent

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75867 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775