[GTK3] Override gtk_im_module only if it was set to xim #1949
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From ibus/ibus#2331 (comment) "There are two modes to communicate between IBus and GTK applications."
Note that "wayland" im module is another incarnation of ibus. The only thing that was broken for sure is "xim" so override only it under Gnome on X11 to prevent making SWT(and as a result Eclipse) use non-default IM modules and thus exposing different behaviour than other apps.