@kovidgoyal
So the title isn't in its own box?
Actually imho its more clean the way it is (aligned at top, line 1 always at the same level, no matter if there is a second one or not). I don't think vertical centering is necessary.
What is strange to me is the difference e.g. from "test library" to "save to disk".
Not even the icon baselines are at the same level, whereas it works for other single line titles like "mark books" or "preferences".
The only faulty ones are "test library", "Connect/share" and maybe the donation button which doesn't have a title for whatever reason.
/edit
Corrected those three and gave the font a bit less top/bottom padding - already looks gorgeous, even without caring about min-width!
Unfortunately I can't tell where the differences come from. It has to be something programatically or different alphatransparency-padding hardcoded in icon images?
/edit2
How about adding a dummy line to "test library" and "Connect/share"? Just an \n at the end.