feat: track buffer line numbers and switch to grep previewer

lua/smart-open/entry/create.lua

@@ -65,6 +65,7 @@ local function create_entry_data(path, history, context)
     if loaded then
       if loaded.bufnr then
         entry.buf = loaded.bufnr
+        entry.lnum = loaded.lnum
         entry.modified = loaded.is_modified
       end
       scores.open = weights.open

lua/telescope/_extensions/smart_open/buffers.lua

@@ -5,7 +5,8 @@ local function get_buffer_list()
     if vim.fn.buflisted(buf) == 1 and vim.api.nvim_buf_get_name(buf) ~= "" then
       result[vim.api.nvim_buf_get_name(buf)] = {
         bufnr = buf,
-        is_modified = vim.api.nvim_buf_get_option(buf, "modified")
+        is_modified = vim.api.nvim_buf_get_option(buf, "modified"),
+        lnum = vim.fn.getbufinfo(buf)[1].lnum,
       }
     end
   end

lua/telescope/_extensions/smart_open/picker.lua

@@ -88,7 +88,7 @@ function M.start(opts)
       return true
     end,
     finder = finder,
-    previewer = telescope_config.file_previewer(opts),
+    previewer = telescope_config.grep_previewer(opts),
     sorter = sorters.Sorter:new({
       -- Just reverse the relevance values for sorting
       scoring_function = function(_, _, x)