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https://developer.gnome.org/gtk3/unstable/GtkButton.html#gtk-button-new-from-stock * use custom buttons * replace stock-id with icon-name https://developer.gnome.org/gtk3/3.13/GtkToolButton.html#GtkToolButton--stock-id update icon names * use correct gtk menu icon * zoom-fit-best icon name has changed * add icon to document-open in startup wizzard
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