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This seems to cause errors when compiling with gcc-11. Although this is
most likely a compiler bug, specifiying the template parameter type in
this case isn't necessary.

Fixes: QTBUG-91909
Fixes: QTBUG-90568
Pick-to: 6.0 6.1 5.15
Change-Id: Ib231257ccb2e16cc533f23ca5840d31e26a66d53
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>