feat: cycle prompt history (#521)

history is enabled on default but cycle_history_next and cycle_history_prev is not mapped yet

Example:
require('telescope').setup {
  defaults = {
    mappings = {
      i = {
        ["<C-Down>"] = require('telescope.actions').cycle_history_next,
        ["<C-Up>"] = require('telescope.actions').cycle_history_prev,
      }
    }
  }
}

For more information :help telescope.defaults.history

big thanks to clason and all other testers :)

lua/telescope/pickers.lua

@@ -473,7 +473,7 @@ function Picker:find()
   pcall(a.nvim_buf_set_option, prompt_bufnr, 'filetype', 'TelescopePrompt')
 
   if self.default_text then
-    vim.api.nvim_buf_set_lines(prompt_bufnr, 0, 1, false, {self.default_text})
+    self:set_prompt(self.default_text)
   end
 
   if self.initial_mode == "insert" then
@@ -544,6 +544,11 @@ function Picker:delete_selection(delete_cb)
   end)
 end
 
+function Picker:set_prompt(str)
+  -- TODO(conni2461): As soon as prompt_buffers are fix use this:
+  -- vim.api.nvim_buf_set_lines(self.prompt_bufnr, 0, 1, false, { str })
+  vim.api.nvim_feedkeys(str, 'n', false)
+end
 
 function Picker.close_windows(status)
   local prompt_win = status.prompt_win