patch 8.2.1811: mapping Ctrl-key does not work for '{', '}' and '|'
Problem: Mapping Ctrl-key does not work for '{', '}' and '|'.
Solution: Remove the shift modifier. (closes #6457)
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index df96bde..cfd48b5 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -839,8 +839,15 @@
When modifyOtherKeys is enabled you can map <C-[> and <C-S-{>: >
imap <C-[> [[[
- imap <C-S-{> {{{
-Without modifyOtherKeys <C-[> and <C-S-{> are indistinguishable from Esc.
+ imap <C-{> {{{
+Without modifyOtherKeys <C-[> and <C-{> are indistinguishable from Esc.
+Note that <C-{> is used and not <C-S-[> or <C-S-{>. This works on most
+keyboards. Similarly, <C-}> is used instead of <C-S-]> or <C-S-}> and
+<C-|> instead of <C-S-\> or <C-S-|>. Note that '|' has a special meaning in a
+mapping, see |map-bar|.
+
+WARNING: if you map <C-[> you may very well break any key codes that start
+with Esc. Make sure it comes AFTER other mappings.
A known side effect is that in Insert mode the raw escape sequence is inserted
after the CTRL-V key. This can be used to check whether modifyOtherKeys is