keymap: Support <D-...> (super/command key).

Adds support for:
  - api:vim_input("<D-a>")
  - ":nnoremap <C-D-S-...>" and permutations thereof

UIs must capture the modifier and send it as "<D-...>" to vim_input().

Note: Before this commit, any arbitrary ":nnoremap <{foo}-{bar}>"
mapping could already be invoked with feedkeys("\<{foo}-{bar}>"). This
commit supports "D-" as a modifier that can be combined with "C-", "A-",
"S-" in any order.

For non-GUI (terminal) support, user must:
  :set <D-a>={CSI sequence}
then send the {CSI sequence} from their terminal. But this does not work
yet (regression #2204).

Closes #2190

1 files changed, 9 insertions, 0 deletions

diff --git a/test/functional/ui/input_spec.lua b/test/functional/ui/input_spec.lua
index 4818830940..6f5cadaf81 100644
--- a/test/functional/ui/input_spec.lua
+++ b/test/functional/ui/input_spec.lua
@@ -25,6 +25,9 @@ describe('mappings', function()
     add_mapping('<s-up>', '<s-up>')
     add_mapping('<c-s-up>', '<c-s-up>')
     add_mapping('<c-s-a-up>', '<c-s-a-up>')
+    add_mapping('<c-s-a-d-up>', '<c-s-a-d-up>')
+    add_mapping('<c-d-a>', '<c-d-a>')
+    add_mapping('<d-1>', '<d-1>')
   end)
 
   it('ok', function()
@@ -37,6 +40,12 @@ describe('mappings', function()
     check_mapping('<s-a-c-up>', '<c-s-a-up>')
     check_mapping('<a-c-s-up>', '<c-s-a-up>')
     check_mapping('<a-s-c-up>', '<c-s-a-up>')
+    check_mapping('<c-s-a-d-up>', '<c-s-a-d-up>')
+    check_mapping('<s-a-d-c-up>', '<c-s-a-d-up>')
+    check_mapping('<d-s-a-c-up>', '<c-s-a-d-up>')
+    check_mapping('<c-d-a>', '<c-d-a>')
+    check_mapping('<d-c-a>', '<c-d-a>')
+    check_mapping('<d-1>', '<d-1>')
   end)
 end)