fix: telescope errors when exiting with no preview

lua/telescope/_extensions/model.lua

@@ -28,9 +28,10 @@ local function entry_maker(bufnr)
   display = display .. ' [' .. tostring(#chat_buf.contents.messages) .. ']'
 
   return {
-    value = bufnr,
+    value = display,
     display = display,
     ordinal = bufnr,
+    bufnr = bufnr,
   }
 end
 
@@ -43,16 +44,20 @@ local function create_bare_buffer_previewer(title)
       if self.state and self.state.winid then
         -- https://github.com/nvim-telescope/telescope.nvim/blob/0c12735d5aff6a48ffd8111bf144dc2ff44e5975/lua/telescope/previewers/buffer_previewer.lua#L396
         -- push a new empty buffer because telescope deletes the last buffer
-        local bufnr = vim.api.nvim_create_buf(false, true)
-        utils.win_set_buf_noautocmd(self.state.winid, bufnr)
+        if vim.api.nvim_win_is_valid(self.state.winid) then -- can become invalid somehow
+          local bufnr = vim.api.nvim_create_buf(false, true)
+          utils.win_set_buf_noautocmd(self.state.winid, bufnr)
+        end
       end
     end,
     preview_fn = function(self, entry, status)
       local preview_winid = status.layout.preview
         and status.layout.preview.winid
 
-      vim.api.nvim_win_set_buf(preview_winid, entry.value)
-      self.state.winid = preview_winid
+      if vim.api.nvim_win_is_valid(preview_winid) then
+        vim.api.nvim_win_set_buf(preview_winid, entry.bufnr)
+        self.state.winid = preview_winid
+      end
     end,
     title = title,
   })
@@ -68,15 +73,11 @@ local function mchat(opts)
         results = get_mchat_buffers(),
         entry_maker = entry_maker,
       }),
+      -- TODO the prompt doesn't actually filter the entries but I have no idea how to make telescope do that
+      -- there doesn't seem to be a place to plug in a function to just filter the entries based on prompt
+      -- is it part of the finder? sorter?
+      -- currently the prompt seems to filter results by the initial results (so the buffer number)
       sorter = conf.generic_sorter(opts),
-      attach_mappings = function(prompt_bufnr)
-        actions.select_default:replace(function()
-          actions.close(prompt_bufnr)
-          local selection = action_state.get_selected_entry()
-          vim.api.nvim_set_current_buf(selection.value)
-        end)
-        return true
-      end,
       previewer = create_bare_buffer_previewer('model.nvim mchat buffers'),
     })
     :find()