[Fix clojure-emacs#597] Don't process incomplete messages unless sure

  Probably also fixes the related clojure-emacs#583 and clojure-emacs#586.

CHANGELOG.md

@@ -14,7 +14,8 @@ for presenting fontified documentation, including Javadoc.
 * `cider-select` can now switch to the `*cider-error*` buffer (bound to `x`).
 
 ### Changes
-
+* [#597](https://github.com/clojure-emacs/cider/issues/597) Don't process reple
+  messages unless the whole message has been received.
 * [#603](https://github.com/clojure-emacs/cider/pull/603) New variable
 `cider-show-error-buffer` to control the behavior of the error buffer. Obsoletes
 `cider-popup-on-error`, `cider-popup-stacktraces` and

nrepl-client.el

@@ -332,15 +332,22 @@ Assume that any error during decoding indicates an incomplete message."
       (with-demoted-errors
         (while (> (buffer-size) 1)
           (let ((responses (nrepl-net-decode)))
-            (dolist (response responses)
-              (nrepl-dispatch response))))))))
+            (dolist (r responses)
+              (nrepl-dispatch r))))))))
+
+(defvar cider-wait-before-processing 0.01
+  "Seconds to wait before processing nrepl output.")
 
 (defun nrepl-net-filter (process string)
   "Decode the message(s) from PROCESS contained in STRING and dispatch."
   (with-current-buffer (process-buffer process)
     (goto-char (point-max))
     (insert string))
-  (nrepl-net-process-input process))
+  ;; end of the dict maybe?
+  (when (eq ?e (aref string (1- (length string))))
+    ;; wait a bit to make sure we are at the real end
+    (unless (accept-process-output process cider-wait-before-processing)
+      (nrepl-net-process-input process))))
 
 (defun nrepl-sentinel (process message)
   "Handle sentinel events from PROCESS.