<p>Yeah apparently looking at your screenshots GTK2 does a "better" job with underallocation (when a control is given less space than its minimal requested size).  There's not much we can do about that, save being careful which widgets we use in the sidebar -- but plugins can go there, which I believe is the case in your example.</p>
<p>BTW, this is likely to be affected by a lot of theme details, including you using a monospaced font everywhere, which likely takes more space than other fonts.  Not saying it's a problem, just that might be one of the many contributing factors -- yet the root cause being the sidebar gets less width than it asked for, and doesn't behave so well in this case.</p>

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