IVsUndoUnit::fChangeData Method ()
Visual Studio 2015
Indicates whether the undo unit applies to UI only and does not change the document data.
Assembly: Microsoft.VisualStudio.TextManager.Interop (in Microsoft.VisualStudio.TextManager.Interop.dll)
From textmgr.idl:
HRESULT IVsUndoUnit::fChangeData();
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