Use GETQUOTAROOT instead of GETQUOTA.

* At least with my ISP, there is no "" root, so the command would fail when used
  as is.
* Now we always use the GETQUOTAROOT command instead, by default for the INBOX
  mailbox. This isn't entirely correct either, but better than nothing.

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/Commands.cpp

@@ -740,7 +740,7 @@ GetQuotaCommand::GetQuotaCommand(const char* mailboxName)
 BString
 GetQuotaCommand::CommandString()
 {
-	BString command = "GETQUOTA \"";
+	BString command = "GETQUOTAROOT \"";
 	command += fMailboxName;
 	command += "\"";
 	return command;
@@ -750,12 +750,15 @@ GetQuotaCommand::CommandString()
 bool
 GetQuotaCommand::HandleUntagged(Response& response)
 {
-	if (!response.IsCommand("QUOTA") || response.IsListAt(1))
+	if (!response.IsCommand("QUOTA") || !response.IsListAt(2))
 		return false;
 
-	const ArgumentList& arguments = response.ListAt(1);
-	fUsedStorage = (uint64)arguments.NumberAt(0) * 1024;
-	fTotalStorage = (uint64)arguments.NumberAt(1) * 1024;
+	const ArgumentList& arguments = response.ListAt(2);
+	if (!arguments.EqualsAt(0, "STORAGE"))
+		return false;
+
+	fUsedStorage = (uint64)arguments.NumberAt(1) * 1024;
+	fTotalStorage = (uint64)arguments.NumberAt(2) * 1024;
 
 	return true;
 }

src/add-ons/mail_daemon/inbound_protocols/imap/imap_lib/Commands.h

@@ -289,7 +289,8 @@ private:
 
 class GetQuotaCommand : public Command, public Handler {
 public:
-								GetQuotaCommand(const char* mailboxName = "");
+								GetQuotaCommand(
+									const char* mailboxName = "INBOX");
 
 			BString				CommandString();
 			bool				HandleUntagged(Response& response);