oc-folder: Make deleted items synched when shared

By keeping mid on moving messages by soft deleting and
only if srcMid is different from targetMid.

This makes restore/shared deleted items work.

It also requires to do the following to work smoothly:

* Do not add soft-deleted messages in ensureIDsForChildKeys
* Return soft-deleted messages on getDeletedFMIDs
* Do not register a new mid if the URL is matched with soft deleted messages

OpenChange/MAPIStoreFolder.m

@@ -679,6 +679,7 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
   //TALLOC_CTX *memCtx;
   struct SRow aRow;
   struct SPropValue property;
+  uint8_t deleteFlags;
 
   [self logWithFormat: @"-moveCopyMessageWithMID: 0x%.16llx .. withMID: 0x%.16llx .. wantCopy: %d", srcMid, targetMid, wantCopy];
 
@@ -709,7 +710,9 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
     }
   [destMsg save: memCtx];
   if (!wantCopy)
-    rc = [sourceFolder deleteMessageWithMID: srcMid andFlags: 0];
+    /* We want to keep mid for restoring/shared data to work if mids are different. */
+    deleteFlags = (srcMid == targetMid) ? MAPISTORE_PERMANENT_DELETE : MAPISTORE_SOFT_DELETE;
+    rc = [sourceFolder deleteMessageWithMID: srcMid andFlags: deleteFlags];
 
  end:
   //talloc_free (memCtx);
@@ -949,6 +952,7 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
   NSString *baseURL, *URL, *key;
   NSArray *newIDs;
   uint64_t idNbr;
+  bool softDeleted;
   
   baseURL = [self url];
 
@@ -959,8 +963,8 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
     {
       key = [keys objectAtIndex: count];
       URL = [NSString stringWithFormat: @"%@%@", baseURL, key];
-      idNbr = [mapping idFromURL: URL];
-      if (idNbr == NSNotFound)
+      idNbr = [mapping idFromURL: URL isSoftDeleted: &softDeleted];
+      if (idNbr == NSNotFound && !softDeleted)
         [missingURLs addObject: URL];
     }
 
@@ -1091,6 +1095,7 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
   MAPIStoreMapping *mapping;
   struct UI8Array_r *fmids;
   uint64_t fmid;
+  bool softDeleted;
 
   keys = [self getDeletedKeysFromChangeNumber: changeNum andCN: &cnNbr
                                   inTableType: tableType];
@@ -1117,10 +1122,10 @@ Class NSExceptionK, MAPIStoreFAIMessageK, MAPIStoreMessageTableK, MAPIStoreFAIMe
         {
           url = [NSString stringWithFormat: format,
                           baseURL, [keys objectAtIndex: count]];
-          fmid = [mapping idFromURL: url];
+          fmid = [mapping idFromURL: url isSoftDeleted: &softDeleted];
           if (fmid != NSNotFound) /* if no fmid is returned, then the object
                                      "never existed" in the OpenChange
-                                     databases */
+                                     databases. Soft-deleted messages are returned back */
             {
               fmids->lpui8[fmids->cValues] = fmid;
               fmids->cValues++;

OpenChange/MAPIStoreMapping.h

@@ -49,6 +49,8 @@
 - (NSString *) urlFromID: (uint64_t) idKey;
 
 - (uint64_t) idFromURL: (NSString *) url;
+- (uint64_t) idFromURL: (NSString *) url
+         isSoftDeleted: (bool *) softDeleted;
 - (BOOL) registerURL: (NSString *) urlString
               withID: (uint64_t) idNbr;
 - (void) registerURLs: (NSArray *) urlString

OpenChange/MAPIStoreMapping.m

@@ -160,6 +160,21 @@ MAPIStoreMappingKeyFromId (uint64_t idNbr)
     return NSNotFound;
 }
 
+- (uint64_t) idFromURL: (NSString *) url
+         isSoftDeleted: (bool *) softDeleted
+{
+  enum mapistore_error ret;
+  uint64_t idNbr;
+
+  ret = indexing->get_fmid(indexing, [username UTF8String], [url UTF8String],
+                           false, &idNbr, softDeleted);
+
+  if (ret != MAPISTORE_SUCCESS)
+    return NSNotFound;
+
+  return idNbr;
+}
+
 - (void) _updateFolderWithURL: (NSString *) oldURL
                       withURL: (NSString *) urlString
 {
@@ -217,7 +232,7 @@ MAPIStoreMappingKeyFromId (uint64_t idNbr)
 {
   NSString *oldURL;
   uint64_t oldIdNbr;
-  bool rc;
+  bool rc, softDeleted;
 
   oldURL = [self urlFromID: idNbr];
   if (oldURL != NULL)
@@ -228,13 +243,16 @@ MAPIStoreMappingKeyFromId (uint64_t idNbr)
       return NO;
     }
 
-  oldIdNbr = [self idFromURL: urlString];
+  oldIdNbr = [self idFromURL: urlString isSoftDeleted: &softDeleted];
   if (oldIdNbr != NSNotFound)
     {
-      [self errorWithFormat:
-              @"attempt to double register an entry with idNbr ('%@', %lld,"
-            @" 0x%.16"PRIx64", oldid=0x%.16"PRIx64")",
-            urlString, idNbr, idNbr, oldIdNbr];
+      if (softDeleted)
+        [self logWithFormat: @"Attempt to register a soft-deleted %@", urlString];
+      else
+        [self errorWithFormat:
+                @"attempt to double register an entry with idNbr ('%@', %lld,"
+              @" 0x%.16"PRIx64", oldid=0x%.16"PRIx64")",
+              urlString, idNbr, idNbr, oldIdNbr];
       return NO;
     }
   else