From 1cc482069a3407132aeb43a55d6dc284153e79c7 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sun, 9 Apr 2017 13:41:59 +0200
Subject: patch 8.0.0554: toupper and tolower don't work properly for Turkish

Problem:    Toupper and tolower don't work properly for Turkish when 'casemap'
            contains "keepascii". (Bjorn Linse)
Solution:   When 'casemap' contains "keepascii" use ASCII toupper/tolower.
---
 src/charset.c               |  4 ++++
 src/testdir/test_normal.vim | 11 +++++++++++
 src/version.c               |  2 ++
 3 files changed, 17 insertions(+)

diff --git a/src/charset.c b/src/charset.c
index cdb9e48e4e..d649179dd7 100644
--- a/src/charset.c
+++ b/src/charset.c
@@ -1733,6 +1733,8 @@ vim_toupper(int c)
 	if (enc_latin1like)
 	    return latin1upper[c];
     }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOUPPER_ASC(c);
     return TOUPPER_LOC(c);
 }
 
@@ -1757,6 +1759,8 @@ vim_tolower(int c)
 	if (enc_latin1like)
 	    return latin1lower[c];
     }
+    if (c < 0x80 && (cmp_flags & CMP_KEEPASCII))
+	return TOLOWER_ASC(c);
     return TOLOWER_LOC(c);
 }
 #endif
diff --git a/src/testdir/test_normal.vim b/src/testdir/test_normal.vim
index aa82992a7b..155ddbfb30 100644
--- a/src/testdir/test_normal.vim
+++ b/src/testdir/test_normal.vim
@@ -1619,6 +1619,17 @@ fun! Test_normal30_changecase()
       call assert_equal("i\u0131", getline(1))
       call assert_equal("i\u0131", tolower("iI"))
 
+      set casemap&
+      call setline(1, 'iI')
+      1normal gUU
+      call assert_equal("II", getline(1))
+      call assert_equal("II", toupper("iI"))
+
+      call setline(1, 'iI')
+      1normal guu
+      call assert_equal("ii", getline(1))
+      call assert_equal("ii", tolower("iI"))
+
       lang en_US.UTF-8
     catch /E197:/
       " can't use Turkish locale
diff --git a/src/version.c b/src/version.c
index 9fb32c9453..578cfe3bf7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    554,
 /**/
     553,
 /**/
-- 
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