fix tab/s-tab with snippets

nvim/lua/darcula/utils/globals.lua

@@ -77,7 +77,11 @@ NV_Darcula_Coc_Shift_Tab_Complete = function()
     return vim.fn["coc#pum#prev"](1)
   end
 
-  return "<C-h>"
+  if vim.fn["coc#jumpable"](-1) == 1 then
+    return vim.fn["coc#rpc#request"]("doKeymap", {"snippets-previous"})
+  end
+
+  return "<S-Tab>"
 end
 
 NV_Darcula_Coc_Tab_Complete = function()
@@ -85,15 +89,17 @@ NV_Darcula_Coc_Tab_Complete = function()
     return vim.fn["coc#pum#next"](1)
   end
 
+  if vim.fn["coc#expandableOrJumpable"]() == 1 then
+    return vim.fn["coc#rpc#request"]("doKeymap", {"snippets-expand-jump"})
+  end
+
   local check_backspace = function()
     local col = vim.api.nvim_win_get_cursor(0)[2]
-    return (col == 0 or
+    return col == 0 or vim.api.nvim_get_current_line():sub(col, col):match("%s")
-      vim.api.nvim_get_current_line():sub(col, col):match("%s")) and
-      true
   end
 
   if check_backspace() then
-    return "<tab>"
+    return "<Tab>"
   end
 
   return vim.fn["coc#refresh"]()