Add missing lok::Document::setPartMode() wrapper

Change-Id: I5dd5f0cfb8b34621b18a35be682249e042d9b173
(cherry picked from commit 42844c2a)

include/LibreOfficeKit/LibreOfficeKit.h

@@ -93,10 +93,7 @@ struct _LibreOfficeKitDocumentClass
     char* (*getPartName) (LibreOfficeKitDocument* pThis,
                           int nPart);
 
-    /** Sets mode of the current part.
-     *
-     * @param nMode - element from the LibreOfficeKitPartMode enum.
-     */
+    /// @see lok::Document::setPartMode().
     void (*setPartMode) (LibreOfficeKitDocument* pThis,
                          int nMode);
 
@@ -118,6 +115,7 @@ struct _LibreOfficeKitDocumentClass
     /// @see lok::Document::initializeForRendering().
     void (*initializeForRendering) (LibreOfficeKitDocument* pThis);
 
+    /// @see lok::Document::registerCallback().
     void (*registerCallback) (LibreOfficeKitDocument* pThis,
                               LibreOfficeKitCallback pCallback,
                               void* pData);

include/LibreOfficeKit/LibreOfficeKit.hxx

@@ -94,6 +94,11 @@ public:
         return mpDoc->pClass->getPartName(mpDoc, nPart);
     }
 
+    inline void setPartMode(int nMode)
+    {
+        mpDoc->pClass->setPartMode(mpDoc, nMode);
+    }
+
     /**
      * Renders a subset of the document to a pre-allocated buffer.
      *