ews: use attachment displayname as fallback

Use PR_DISPLAY_NAME property if PR_ATTACH_LONG_FILENAME is not set.

Author: juliaschroeder

exch/ews/structures.cpp

@@ -1326,7 +1326,7 @@ tAlternateId::tAlternateId(Enum::IdFormatType format, std::string id, std::strin
 tAttachment::tAttachment(const sAttachmentId& aid, const sShape& shape)
 {
 	AttachmentId.emplace(aid);
-	fromProp(shape.get(PR_ATTACH_LONG_FILENAME), Name);
+	fromProp(shape.get(PR_ATTACH_LONG_FILENAME), Name) || fromProp(shape.get(PR_DISPLAY_NAME), Name);
 	fromProp(shape.get(PR_ATTACH_MIME_TAG), ContentType);
 	fromProp(shape.get(PR_ATTACH_CONTENT_ID), ContentId);
 	fromProp(shape.get(PR_ATTACH_SIZE), Size);

exch/ews/structures.hpp

@@ -521,7 +521,7 @@ struct tAttachment : public NS_EWS_Types {
 	static sAttachment create(const sAttachmentId&, sShape&&);
 
 	std::optional<sAttachmentId> AttachmentId;
-	std::optional<std::string> Name;///< PR_ATTACH_LONG_FILENAM
+	std::optional<std::string> Name;///< PR_ATTACH_LONG_FILENAME or PR_DISPLAYNAME
 	std::optional<std::string> ContentType; ///< PR_ATTACH_MIME_TAG
 	std::optional<std::string> ContentId; ///< PR_ATTACH_CONTENT_ID
 	std::optional<std::string> ContentLocation;