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Question #2: If you want to run an application with X11 backend even within a Wayland session, you may try using a toolkit-specific switch to enforce X11.

For Gtk+, set the GDK_BACKEND environment variable. Open a terminal and execute GDK_BACKEND=X11 gedit for example.

For Qt, the default (in Fedora 28, as of 2018-07-29 and earlier) is to start any application with X11 backend. This may change in the future. the -platform command line option may help. Right now, you can enforce using the wayland backend by executing a Qt5 application like this: kwrite -platform wayland. There is probably an option for X11 too.