Created attachment 150065 [details]
let: gtk right: windows 7
When you use sifr (other icon themes will follow) in windows all items in menubar -> File has icons in writer and calc. On GTK there were not shown but are available
qt5 backend work fine, only gtk3 backend issue
you have to activate that gtk3 should show the menubar icons first.
*** This bug has been marked as a duplicate of bug 123265 ***