[MSCTFIME][CICERO] Implement CFnDocFeed (#6513)

Supporting TIPs...
JIRA issue: CORE-19360
- Add missing CicInputContext methods.
- Implement CFnDocFeed class.

dll/ime/msctfime/inputcontext.cpp

@@ -65,7 +65,7 @@ CicInputContext::OnStartComposition(
     ITfCompositionView *pComposition,
     BOOL *pfOk)
 {
-    if ((m_cCompLocks <= 0) || m_dwUnknown6_5)
+    if ((m_cCompLocks <= 0) || m_bReconverting)
     {
         *pfOk = TRUE;
         ++m_cCompLocks;
@@ -103,13 +103,10 @@ CicInputContext::GetGuidAtom(
     _Out_opt_ LPDWORD pdwGuidAtom)
 {
     CicIMCCLock<CTFIMECONTEXT> imeContext(imcLock.get().hCompStr);
-    HRESULT hr = imeContext.m_hr;
-    if (!imeContext)
-        hr = E_FAIL;
-    if (FAILED(hr))
-        return hr;
+    if (FAILED(imeContext.m_hr))
+        return imeContext.m_hr;
 
-    hr = E_FAIL;
+    HRESULT hr = E_FAIL;
     if (iAtom < m_cGuidAtoms)
     {
         *pdwGuidAtom = m_adwGuidAtoms[iAtom];
@@ -251,6 +248,36 @@ CicInputContext::OnCleanupContext(
     return S_OK;
 }
 
+/// @unimplemented
+HRESULT CicInputContext::SetupDocFeedString(CicIMCLock& imcLock, UINT uCodePage)
+{
+    return E_NOTIMPL;
+}
+
+/// @unimplemented
+HRESULT CicInputContext::EscbClearDocFeedBuffer(CicIMCLock& imcLock, BOOL bFlag)
+{
+    return E_NOTIMPL;
+}
+
+/// @unimplemented
+HRESULT
+CicInputContext::SetupReconvertString(
+    CicIMCLock& imcLock,
+    ITfThreadMgr_P *pThreadMgr,
+    UINT uCodePage,
+    DWORD dwUnknown61,
+    BOOL bUndo)
+{
+    return E_NOTIMPL;
+}
+
+/// @unimplemented
+HRESULT CicInputContext::EndReconvertString(CicIMCLock& imcLock)
+{
+    return E_NOTIMPL;
+}
+
 /// Retrieves the IME information.
 /// @implemented
 HRESULT