https://bugs.winehq.org/show_bug.cgi?id=42273
--- Comment #3 from rebe@gmx.net --- Another workaround - previously unavailable - is to use small scale Tango icon set.
Fenster - Einstellungen (CTRL-E) - Anzeige - Toolbar anzeigen - Icon Satz laden "tango!"
With the default icon set the behaviour is still reproducable under wine 2.9