msgpack: Replace FUNC_ATTR_DEFERRED by FUNC_ATTR_ASYNC

API functions exposed via msgpack-rpc now fall into two categories:

- async functions, which are executed as soon as the request is parsed
- sync functions, which are invoked in nvim main loop when processing the
  `K_EVENT special key

Only a few functions which can be safely executed in any context are marked as
async.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/nvim/msgpack_rpc/defs.h b/src/nvim/msgpack_rpc/defs.h
index 0492a65290..d97cf28ca1 100644
--- a/src/nvim/msgpack_rpc/defs.h
+++ b/src/nvim/msgpack_rpc/defs.h
@@ -11,9 +11,8 @@ typedef struct {
                uint64_t request_id,
                Array args,
                Error *error);
-  bool defer;  // Should the call be deferred to the main loop? This should
-               // be true if the function mutates editor data structures such
-               // as buffers, windows, tabs, or if it executes vimscript code.
+  bool async;  // function is always safe to run immediately instead of being
+               // put in a request queue for handling when nvim waits for input.
 } MsgpackRpcRequestHandler;
 
 /// Initializes the msgpack-rpc method table