IVsSyntheticTextSession::UnadviseClient Method ()
Visual Studio 2015
Tells the session to sever its link, and drop its COM reference, to the client.
Assembly: Microsoft.VisualStudio.TextManager.Interop (in Microsoft.VisualStudio.TextManager.Interop.dll)
From textmgr.idl:
HRESULT IVsSyntheticTextSession::UnadviseClient();
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