feat(bultin.buffer): add select_current option (#2918)

lua/telescope/builtin/__internal.lua

@@ -949,6 +949,9 @@ internal.buffers = function(opts)
       local idx = ((buffers[1] ~= nil and buffers[1].flag == "%") and 2 or 1)
       table.insert(buffers, idx, element)
     else
+      if opts.select_current and flag == "%" then
+        default_selection_idx = bufnr
+      end
       table.insert(buffers, element)
     end
   end

lua/telescope/builtin/init.lua

@@ -349,6 +349,7 @@ builtin.reloader = require_on_exported_call("telescope.builtin.__internal").relo
 ---@field bufnr_width number: Defines the width of the buffer numbers in front of the filenames  (default: dynamic)
 ---@field file_encoding string: file encoding for the previewer
 ---@field sort_buffers function: sort fn(bufnr_a, bufnr_b). true if bufnr_a should go first. Runs after sorting by most recent (if specified)
+---@field select_current boolean: select current buffer (default: false)
 builtin.buffers = require_on_exported_call("telescope.builtin.__internal").buffers
 
 --- Lists available colorschemes and applies them on `<cr>`