When "Server" GtkComboBox is selected, TAB key doesn't work
Created by: ppsshh
Unable to switch to the next input field using keyboard TAB button if "Server" ComboBox is focused/selected (in "New Connection" and "Edit Connection" windows)
Bug introduced in b54ea4af by the line
gtk_widget_set_can_focus (widget, TRUE);
When compiled without that line, everything works as expected.