feat: Full width select (#1403)

Can be changed back by setting 
telescope.setup {
  defaults = {
    hl_result_eol = false,
  }
}

lua/telescope/pickers/highlights.lua

@@ -1,5 +1,6 @@
 local a = vim.api
 local log = require "telescope.log"
+local conf = require("telescope.config").values
 
 local highlights = {}
 
@@ -69,7 +70,13 @@ function Highlighter:hi_selection(row, caret)
   a.nvim_buf_clear_namespace(results_bufnr, ns_telescope_selection, 0, -1)
   a.nvim_buf_add_highlight(results_bufnr, ns_telescope_selection, "TelescopeSelectionCaret", row, 0, #caret)
 
-  a.nvim_buf_add_highlight(results_bufnr, ns_telescope_selection, "TelescopeSelection", row, #caret, -1)
+  a.nvim_buf_set_extmark(
+    results_bufnr,
+    ns_telescope_selection,
+    row,
+    #caret,
+    { end_line = row + 1, hl_eol = conf.hl_result_eol, hl_group = "TelescopeSelection" }
+  )
 end
 
 function Highlighter:hi_multiselect(row, is_selected)