Desktop environments have a user interface font setting (for example on GNOME 3 this defaults to Cantarell). This is not necessarily the same as what the Sans alias refers to. Sublime Text 2 appears to just uses Sans as its font, which for me means that its UI (apart from the menu bar which I guess is rendered by GTK) is using a different font to the rest of my desktop. It would be good if it could instead use the desktop configured font instead (not entirely sure how to find it, GTK possibly has a mechanism to do so), or at least have a configuration option to set the UI font.
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