riched20: EM_GETTEXTEX with GT_USECRLF should not leave a single CR when running out of space.

dlls/riched20/editor.c

@@ -2804,7 +2804,10 @@ int ME_GetTextW(ME_TextEditor *editor, WCHAR *buffer, int nStart, int nChars, in
       if (!ME_FindItemFwd(item, diRun))
         /* No '\r' is appended to the last paragraph. */
         nLen = 0;
-      else {
+      else if (bCRLF && nChars == 1) {
+        nLen = 0;
+        nChars = 0;
+      } else {
         *buffer = '\r';
         if (bCRLF)
         {

dlls/riched20/tests/editor.c

@@ -1116,6 +1116,33 @@ static void test_EM_SETTEXTEX(void)
   ok(strcmp((const char *)buf, TestItem2_after) == 0,
       "WM_GETTEXT did *not* see \\r converted to \\r\\n pairs.\n");
 
+  /* Baseline test for just-enough buffer space for string */
+  getText.cb = (lstrlenW(TestItem2) + 1) * sizeof(WCHAR);
+  getText.codepage = 1200;  /* no constant for unicode */
+  getText.flags = GT_DEFAULT;
+  getText.lpDefaultChar = NULL;
+  getText.lpUsedDefaultChar = NULL;
+  memset(buf, 0, MAX_BUF_LEN);
+  SendMessage(hwndRichEdit, EM_GETTEXTEX, (WPARAM)&getText, (LPARAM) buf);
+  ok(lstrcmpW(buf, TestItem2) == 0,
+      "EM_GETTEXTEX results not what was set by EM_SETTEXTEX\n");
+
+  /* When there is enough space for one character, but not both, of the CRLF
+     pair at the end of the string, the CR is not copied at all. That is,
+     the caller must not see CRLF pairs truncated to CR at the end of the
+     string.
+   */
+  getText.cb = (lstrlenW(TestItem2) + 1) * sizeof(WCHAR);
+  getText.codepage = 1200;  /* no constant for unicode */
+  getText.flags = GT_USECRLF;   /* <-- asking for CR -> CRLF conversion */
+  getText.lpDefaultChar = NULL;
+  getText.lpUsedDefaultChar = NULL;
+  memset(buf, 0, MAX_BUF_LEN);
+  SendMessage(hwndRichEdit, EM_GETTEXTEX, (WPARAM)&getText, (LPARAM) buf);
+  ok(lstrcmpW(buf, TestItem1) == 0,
+      "EM_GETTEXTEX results not what was set by EM_SETTEXTEX\n");
+
+
   /* \r\n pairs get changed into \r */
   setText.codepage = 1200;  /* no constant for unicode */
   getText.codepage = 1200;  /* no constant for unicode */