fix: luacheck, buffer override erroring with mark not set

lua/nvim-tree.lua

@@ -218,8 +218,7 @@ end
 
 local function is_file_readable(fname)
   local stat = luv.fs_stat(fname)
-  if not stat or not stat.type == 'file' or not luv.fs_access(fname, 'R') then return false end
-  return true
+  return stat and stat.type == "file" and luv.fs_access(fname, 'R')
 end
 
 local function update_base_dir_with_filepath(filepath)
@@ -238,13 +237,11 @@ function M.find_file(with_open)
   if with_open then
     M.open()
     view.focus()
-    if not is_file_readable(filepath) then return end
-    update_base_dir_with_filepath(filepath)
-    lib.set_index_and_redraw(filepath)
-    return
   end
 
-  if not is_file_readable(filepath) then return end
+  if not is_file_readable(filepath) then
+    return
+  end
   update_base_dir_with_filepath(filepath)
   lib.set_index_and_redraw(filepath)
 end

lua/nvim-tree/view.lua

@@ -189,7 +189,9 @@ function M._prevent_buffer_override()
     end
 
     if a.nvim_buf_is_loaded(M.View.bufnr) and a.nvim_buf_is_valid(M.View.bufnr) then
-      vim.cmd("buffer "..M.View.bufnr)
+      -- pcall necessary to avoid erroring with `mark not set` although no mark are set
+      -- this avoid other issues
+      pcall(vim.api.nvim_win_set_buf, M.get_winnr(), M.View.bufnr)
     end
 
     local bufname = a.nvim_buf_get_name(curbuf)