vim-patch:7.4.502 #2282

Problem:    Language mapping also applies to mapped characters.
Solution:   Add the 'langnoremap' option, when on 'langmap' does not apply to
            mapped characters. (Christian Brabandt)

https://github.com/vim/vim/releases/tag/v7-4-502

src/nvim/macros.h

@@ -77,12 +77,17 @@
  * Adjust chars in a language according to 'langmap' option.
  * NOTE that there is no noticeable overhead if 'langmap' is not set.
  * When set the overhead for characters < 256 is small.
- * Don't apply 'langmap' if the character comes from the Stuff buffer.
+ * Don't apply 'langmap' if the character comes from the Stuff buffer or from a
+ * mapping and the langnoremap option was set.
  * The do-while is just to ignore a ';' after the macro.
  */
 #  define LANGMAP_ADJUST(c, condition) \
   do { \
-    if (*p_langmap && (condition) && !KeyStuffed && (c) >= 0) \
+    if (*p_langmap \
+        && (condition) \
+        && (!p_lnr || (p_lnr && typebuf_maplen() == 0)) \
+        && !KeyStuffed \
+        && (c) >= 0) \
     { \
       if ((c) < 256) \
         c = langmap_mapchar[c]; \