https://bugzilla.redhat.com/show_bug.cgi?id=1475503
--- Comment #3 from Christian Stadelmann rhbz2@genodeftest.de --- (In reply to Mat Booth from comment #2)
Christian,
This does not seem specific to GTK3 either. With GTK2 you can also make the Eclipse window very small such that you can only see the decorations, with no menu bar even. To me this feels like an RFE (it's probably working as designed, and you can just make the dialog bigger again :-)
Thanks for this explanation. If SWT is not setting minimum/preferred sizes for its Gtk widgets, then this issue might be covered by https://bugs.eclipse.org/bugs/show_bug.cgi?id=486068 already.