glade: get rid of GtkContainer.border-width
It's gone from Gtk4. We mostly use it to pad out the pages in the editor and on a couple other places (where the use is probably incorrect). The migration manual suggests that a margin of a child should be used instead. This indeed works for us. However, we need to set four properties from each side, which is not nice. An alternative would be to use a CSS class, butthere's no sensible class in the default theme for the job and it's perhaps not worth adding a custom style sheet for us.
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