lok: send signature status on document load

Change-Id: If164d0edc9343b1db5ee96a2da46c9436ddbc73f
Reviewed-on: https://gerrit.libreoffice.org/62776
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

desktop/source/lib/init.cxx

@@ -1515,8 +1515,10 @@ static LibreOfficeKitDocument* lo_documentLoadWithOptions(LibreOfficeKit* pThis,
             return nullptr;
         }
 
-        return new LibLODocument_Impl(xComponent);
-
+        LibLODocument_Impl* pDocument = new LibLODocument_Impl(xComponent);
+        int nState = doc_getSignatureState(pDocument);
+        pLib->mpCallback(LOK_CALLBACK_SIGNATURE_STATUS, OString::number(nState).getStr(), pLib->mpCallbackData);
+        return pDocument;
     }
     catch (const uno::Exception& exception)
     {

include/LibreOfficeKit/LibreOfficeKitEnums.h

@@ -603,6 +603,11 @@ typedef enum
      * Eg. com.sun.star.presentation.PresentationDocument TextObject
      */
     LOK_CALLBACK_CONTEXT_CHANGED = 39,
+
+    /**
+     * On-load notification of the document signature status.
+     */
+    LOK_CALLBACK_SIGNATURE_STATUS = 40,
 }
 LibreOfficeKitCallbackType;