http://marc.info/?l=mutt-dev&m=128045511126422

Make "move to trash folder" use IMAP COPY.

by Paul Miller (jettero)

--- a/imap/imap.c
+++ b/imap/imap.c
@@ -893,6 +893,12 @@ static int imap_make_msg_set (IMAP_DATA*
           if (hdrs[n]->deleted != HEADER_DATA(hdrs[n])->deleted)
             match = invert ^ hdrs[n]->deleted;
 	  break;
+        case M_EXPIRED: /* imap_fast_trash version of M_DELETED */
+	  if (hdrs[n]->purged)
+	    break;
+          if (hdrs[n]->deleted != HEADER_DATA(hdrs[n])->deleted)
+            match = invert ^ hdrs[n]->deleted;
+	  break;
         case M_FLAG:
           if (hdrs[n]->flagged != HEADER_DATA(hdrs[n])->flagged)
             match = invert ^ hdrs[n]->flagged;
@@ -2028,3 +2034,54 @@ int imap_complete(char* dest, size_t dle
 
   return -1;
 }
+
+int imap_fast_trash() {
+
+    if( Context->magic == M_IMAP && mx_is_imap(TrashPath) ) {
+        IMAP_MBOX mx;
+        IMAP_DATA *idata = (IMAP_DATA *) Context->data;
+        char mbox[LONG_STRING];
+        char mmbox[LONG_STRING];
+        int rc;
+        dprint(1, (debugfile, "[itf] trashcan seems to be on imap.\n"));
+
+        if ( imap_parse_path(TrashPath, &mx) == 0 ) {
+            if( mutt_account_match(&(idata->conn->account), &(mx.account)) ) {
+                dprint(1, (debugfile, "[itf] trashcan seems to be on the same account.\n"));
+
+                imap_fix_path (idata, mx.mbox, mbox, sizeof (mbox));
+                if (!*mbox)
+                    strfcpy (mbox, "INBOX", sizeof (mbox));
+                imap_munge_mbox_name (idata, mmbox, sizeof (mmbox), mbox);
+
+                rc = imap_exec_msgset (idata, "UID COPY", mmbox, M_EXPIRED, 0, 0);
+                if (!rc) {
+                    dprint (1, (debugfile, "imap_copy_messages: No messages del-tagged\n"));
+                    rc = -1;
+                    goto old_way;
+
+                } else if (rc < 0) {
+                    dprint (1, (debugfile, "could not queue copy\n"));
+                    goto old_way;
+
+                } else {
+                    mutt_message (_("Copying %d messages to %s..."), rc, mbox);
+                    return 0;
+                }
+
+            } else {
+                dprint(1, (debugfile, "[itf] trashcan seems to be on a different account.\n"));
+            }
+
+            old_way:
+            FREE (&mx.mbox); /* we probably only need to free this when the parse works */
+
+        } else {
+            dprint(1, (debugfile, "[itf] failed to parse TrashPath.\n" ));
+        }
+
+        dprint(1, (debugfile, "[itf] giving up and trying old fasioned way.\n" ));
+    }
+
+    return 1;
+}
--- a/imap/imap.h
+++ b/imap/imap.h
@@ -72,4 +72,7 @@ void imap_keepalive (void);
 
 int imap_account_match (const ACCOUNT* a1, const ACCOUNT* a2);
 
+/* trash */
+int imap_fast_trash();
+
 #endif
--- a/mx.c
+++ b/mx.c
@@ -802,6 +802,11 @@ static int trash_append (CONTEXT *ctx)
 	&& stc.st_dev == st.st_dev && stc.st_rdev == st.st_rdev)
       return 0;  /* we are in the trash folder: simple sync */
 
+    #ifdef USE_IMAP
+    if( !imap_fast_trash() )
+        return 0;
+    #endif
+
     if ((ctx_trash = mx_open_mailbox (TrashPath, M_APPEND, NULL)) != NULL)
     {
       for (i = 0 ; i < ctx->msgcount ; i++)