fix(previewer): buffer previews for term not initially scrolled (#2899)

(cherry picked from commit e54fbf4)

lua/telescope/previewers/buffer_previewer.lua

@@ -486,7 +486,10 @@ previewers.vimgrep = defaulter(function(opts)
  if entry.bufnr and (p == "[No Name]" or has_buftype) then
  local lines = vim.api.nvim_buf_get_lines(entry.bufnr, 0, -1, false)
  vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, lines)
- jump_to_line(self, self.state.bufnr, entry.lnum)
+ -- schedule so that the lines are actually there and can be jumped onto when we call jump_to_line
+ vim.schedule(function()
+ jump_to_line(self, self.state.bufnr, entry.lnum)
+ end)
  else
  conf.buffer_previewer_maker(p, self.state.bufnr, {
  bufname = self.state.bufname,