[lldb][NFC] Add CompletionRequest::AppendEmptyArgument

This is the only legitimate use we currently have for modifying
a CompletionRequest. Add a utility function for this purpose
and remove the remaining setters which go against the idea of
having an immutable CompletionRequest.

llvm-svn: 372858

1 files changed, 1 insertions, 3 deletions

diff --git a/lldb/source/Interpreter/CommandInterpreter.cpp b/lldb/source/Interpreter/CommandInterpreter.cpp
index 10a80653168..71f766ed7b5 100644
--- a/lldb/source/Interpreter/CommandInterpreter.cpp
+++ b/lldb/source/Interpreter/CommandInterpreter.cpp
@@ -1779,9 +1779,7 @@ void CommandInterpreter::HandleCompletionMatches(CompletionRequest &request) {
         look_for_subcommand = true;
         new_matches.DeleteStringAtIndex(0);
         new_descriptions.DeleteStringAtIndex(0);
-        request.GetParsedLine().AppendArgument(llvm::StringRef());
-        request.SetCursorIndex(request.GetCursorIndex() + 1U);
-        request.SetCursorCharPosition(0);
+        request.AppendEmptyArgument();
       }
     }
     request.AddCompletions(new_matches, new_descriptions);