Sudden fontsize change in GTK due to external events

[Olaf Hering]

After a 'zypper dup', which included update of some font.rpm, all fonts in GTK applications are suddenly larger. Qt applications seem to be unaffected. Firefox and Chromium seem to be unaffected. The change includes window title names in the panel, the window title in all GTK windows, the font size in Terminal, and apparently also this editor window in claws-mail. But for some reason claws-mail did unexpectedly exit.

Does anything in XFCE react to external "font events" (if such thing exists)? It is not clear to me which part of the system is responsible for changing fontsize globally, to file a bug for XFCE or GTK or some other component.

Olaf
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