Remote: read now retry when it did not get all the expected data

src/remote.cc

@@ -89,12 +89,17 @@ void write(Message& msg, const DisplayBuffer& display_buffer)
 
 void read(int socket, char* buffer, size_t size)
 {
+    while (size)
+    {
         int res = ::read(socket, buffer, size);
         if (res == 0)
             throw peer_disconnected{};
-    if (res == -1)
+        if (res < 0)
             throw socket_error{};
-    assert(res == size);
+
+        buffer += res;
+        size   -= res;
+    }
 }
 
 template<typename T>