patch 7.4.928
Problem:    A clientserver message interrupts handling keys of a mapping.
Solution:   Have mch_inchar() send control back to WaitForChar when it is
            interrupted by server message. (James Kolb)
diff --git a/src/os_unix.c b/src/os_unix.c
index 8f059be..314a906 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -401,9 +401,15 @@
     {
 	while (WaitForChar(wtime) == 0)		/* no character available */
 	{
-	    if (!do_resize)	/* return if not interrupted by resize */
+	    if (do_resize)
+		handle_resize();
+#ifdef FEAT_CLIENTSERVER
+	    else if (!server_waiting())
+#else
+	    else
+#endif
+		/* return if not interrupted by resize or server */
 		return 0;
-	    handle_resize();
 #ifdef MESSAGE_QUEUE
 	    parse_queued_messages();
 #endif