patch 7.4.941
Problem:    There is no way to ignore case only for tag searches.
Solution:   Add the 'tagcase' option. (Gary Johnson)
diff --git a/src/buffer.c b/src/buffer.c
index 5d4170f..d1907a4 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1991,6 +1991,7 @@
     clear_string_option(&buf->b_p_ep);
     clear_string_option(&buf->b_p_path);
     clear_string_option(&buf->b_p_tags);
+    clear_string_option(&buf->b_p_tc);
 #ifdef FEAT_INS_EXPAND
     clear_string_option(&buf->b_p_dict);
     clear_string_option(&buf->b_p_tsr);