<p>I think this is a regression in GTK+ 3 where the notebook tabs are massive and full-width. I'm pretty sure you could tweak it in an application-specific CSS file.</p>
<p>The mentioned warning messages are <a href="https://bugzilla.gnome.org/show_bug.cgi?id=773814" rel="nofollow">due to a bug (fix) in GTK+ as well</a>. The other warnings from menus are due to some weirdness in GdkPixbuf IIRC.</p>

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