Description of problem:
Using Wayland after upgrade to F25.

Open rosegarden. Use the "File / Open..." menu. Program crashes.
It also crashes upon a "File / Save As ..." after a successful file open from "File / Open Recent /".

When running from the terminal, I get the following when it crashes:

(rosegarden:6486): Gdk-WARNING **: gdkwindow-x11.c:5554 drawable is not a native X11 window
Segmentation fault (core dumped)

Suggested elsewhere that "The troublemaker here will most likely be xembed and/or the Qt5 gtk QPA." 
and "the problem will be the qt5 gnome qpa hard-assuming wayland"
See https://bbs.archlinux.org/viewtopic.php?id=218680 and https://bbs.archlinux.org/viewtopic.php?id=218831

As suggested elsewhere, thre are two workarounds:
-- start app with GDK_BACKEND=x11 rosegarden
-- use the gnome-x11org login, which essentially applies the above to all apps, IIUC.

The workaround produces this error upon using the "File Open..." dialog
"Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged."

It would appear that this is a known bug (fixed Sept. 21, 2016) in https://github.com/MartinBriza/QGnomePlatform


Version-Release number of selected component:
rosegarden4-16.02-2.fc25

Additional info:
reporter:       libreport-2.8.0
backtrace_rating: 4
cmdline:        rosegarden
executable:     /usr/bin/rosegarden
global_pid:     5648
kernel:         4.8.8-300.fc25.x86_64
pkg_fingerprint: 4089 D8F2 FDB1 9C98
pkg_vendor:     Fedora Project
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 ??
 #1 XChangeProperty at ChProp.c:92
 #2 XSetTransientForHint at SetHints.c:286
 #3 QGtk3Dialog::show at qgtk3dialoghelpers.cpp:133
 #4 QGtk3FileDialogHelper::show at qgtk3dialoghelpers.cpp:258
 #5 QDialogPrivate::setNativeDialogVisible at dialogs/qdialog.cpp:140
 #6 QFileDialog::setVisible at dialogs/qfiledialog.cpp:846
 #7 QDialog::exec at dialogs/qdialog.cpp:544
 #8 Rosegarden::FileDialog::getOpenFileName at /usr/src/debug/rosegarden-16.02/src/gui/widgets/FileDialog.cpp:131
 #9 Rosegarden::RosegardenMainWindow::slotFileOpen at /usr/src/debug/rosegarden-16.02/src/gui/application/RosegardenMainWindow.cpp:2009