updated for version 7.4.552

Problem:    Langmap applies to Insert mode expression mappings.
Solution:   Check for Insert mode. (Daniel Hahler)

src/testdir/test_mapping.in

@@ -8,6 +8,15 @@ STARTTEST
 :inoreab чкпр   vim
 GAчкпр 
 
+
+: " langmap should not get remapped in insert mode
+:inoremap { FAIL_ilangmap
+:set langmap=+{ langnoremap
+o+
+: " expr mapping with langmap
+:inoremap <expr> { "FAIL_iexplangmap"
+o+
+
 :/^test/,$w! test.out
 :qa!
 ENDTEST

src/testdir/test_mapping.ok

@@ -1,2 +1,4 @@
 test starts here:
 vim
++
++